diff --git a/doc/internals/list.fig b/doc/internals/list.fig
index dc1f4dc..35663ff 100644
--- a/doc/internals/list.fig
+++ b/doc/internals/list.fig
@@ -1,150 +1,27 @@
-#FIG 3.2
+#FIG 3.2  Produced by xfig version 3.2.7b
 Landscape
 Center
 Metric
-A4      
-100.00
+A4
+119.50
 Single
 -2
 1200 2
-6 720 8325 1080 9135
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 990 8765 765 8765
-2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
-	 765 8415 990 8415 990 9090 765 9090 765 8415
-4 1 0 50 0 14 10 0.0000 4 90 90 880 8967 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 878 8640 N\001
--6
-6 1170 8325 1530 9135
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 1440 8765 1215 8765
-2 2 0 2 0 7 53 0 20 0.000 0 0 -1 0 0 5
-	 1215 8415 1440 8415 1440 9090 1215 9090 1215 8415
-4 1 0 50 0 14 10 0.0000 4 90 90 1330 8967 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 1328 8640 N\001
--6
-6 1620 8325 1980 9135
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 1890 8765 1665 8765
-2 2 0 2 0 4 53 0 20 0.000 0 0 -1 0 0 5
-	 1665 8415 1890 8415 1890 9090 1665 9090 1665 8415
-4 1 0 50 0 14 10 0.0000 4 90 90 1780 8967 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 1778 8640 N\001
--6
-6 2700 8055 3420 9225
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 3150 8675 2925 8675
-2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
-	 2925 8325 3150 8325 3150 9000 2925 9000 2925 8325
-3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
-	1 1 1.00 60.00 120.00
-	 3150 8505 3375 8505 3375 8100 2700 8100 2700 8505 2925 8505
-	 0.000 1.000 1.000 1.000 1.000 0.000
-3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
-	1 1 1.00 60.00 120.00
-	 3150 8820 3375 8820 3375 9225 2700 9225 2700 8820 2925 8820
-	 0.000 1.000 1.000 1.000 1.000 0.000
-4 1 0 50 0 14 10 0.0000 4 90 90 3040 8877 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 3038 8550 N\001
--6
-6 2115 8100 2655 9180
-6 2115 8100 2655 9180
-6 2295 8235 2655 9045
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 2565 8675 2340 8675
-2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
-	 2340 8325 2565 8325 2565 9000 2340 9000 2340 8325
-4 1 0 50 0 14 10 0.0000 4 90 90 2455 8877 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 2453 8550 N\001
--6
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 2565 8325 2115 8325
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 2115 9000 2565 9000
-2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
-	 2115 8100 2565 8100 2565 9180 2115 9180 2115 8100
-4 1 0 50 0 14 12 0.0000 4 120 105 2250 8730 L\001
--6
--6
-6 3420 8100 4095 9225
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 3870 8675 3645 8675
-2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
-	 3645 8325 3870 8325 3870 9000 3645 9000 3645 8325
-3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
-	1 1 1.00 60.00 120.00
-	 3870 8505 4095 8505 4095 8100 3420 8100 3420 8505 3645 8505
-	 0.000 1.000 1.000 1.000 1.000 0.000
-3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
-	1 1 1.00 60.00 120.00
-	 3870 8820 4095 8820 4095 9225 3420 9225 3420 8820 3645 8820
-	 0.000 1.000 1.000 1.000 1.000 0.000
-4 1 0 50 0 14 10 0.0000 4 90 90 3760 8877 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 3758 8550 N\001
--6
-6 4275 8190 4725 9090
-2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
-	 4275 8190 4725 8190 4725 9090 4275 9090 4275 8190
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 4275 8640 4725 8640
-4 1 0 50 0 16 24 0.0000 4 285 270 4500 8550 N\001
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--6
-6 5175 8115 5655 8595
-2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
-	 5190 8130 5640 8130 5640 8580 5190 8580 5190 8130
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 5640 8355 5190 8355
-4 1 0 50 0 16 9 0.0000 4 90 90 5415 8490 P\001
-4 1 0 50 0 16 9 0.0000 4 90 90 5415 8310 N\001
--6
-6 4995 8655 5925 9135
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 5010 8895 5910 8895
-2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
-	 5010 8670 5910 8670 5910 9120 5010 9120 5010 8670
-4 1 0 50 0 14 10 0.0000 4 105 630 5460 8850 list *N\001
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--6
-6 270 8325 630 9135
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 540 8765 315 8765
-2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
-	 315 8415 540 8415 540 9090 315 9090 315 8415
-4 1 0 50 0 14 10 0.0000 4 90 90 430 8967 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 428 8640 N\001
--6
-6 4860 3420 5220 4230
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 5130 3860 4905 3860
-2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
-	 4905 3510 5130 3510 5130 4185 4905 4185 4905 3510
-4 1 0 50 0 14 10 0.0000 4 90 90 5020 4062 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 5018 3735 N\001
--6
-6 5850 3420 6210 4230
-2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
-	 6120 3860 5895 3860
-2 2 0 2 0 7 53 0 20 0.000 0 0 -1 0 0 5
-	 5895 3510 6120 3510 6120 4185 5895 4185 5895 3510
-4 1 0 50 0 14 10 0.0000 4 90 90 6010 4062 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 6008 3735 N\001
--6
 6 3960 3420 4320 4230
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 4230 3860 4005 3860
 2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
 	 4005 3510 4230 3510 4230 4185 4005 4185 4005 3510
-4 1 0 50 0 14 10 0.0000 4 90 90 4120 4062 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 4118 3735 N\001
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+4 1 0 50 0 14 10 0.0000 4 105 105 4118 3735 N\001
 -6
 6 4185 5580 4545 6390
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 4455 6020 4230 6020
 2 2 0 2 0 4 53 0 20 0.000 0 0 -1 0 0 5
 	 4230 5670 4455 5670 4455 6345 4230 6345 4230 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 4345 6222 P\001
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 -6
 6 4905 5445 5445 6525
 6 4905 5445 5445 6525
@@ -153,8 +30,8 @@
 	 5355 6020 5130 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 5130 5670 5355 5670 5355 6345 5130 6345 5130 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 5245 6222 P\001
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+4 1 0 50 0 14 10 0.0000 4 105 105 5243 5895 N\001
 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 5355 5670 4905 5670
@@ -162,7 +39,7 @@
 	 4905 6345 5355 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 4905 5445 5355 5445 5355 6525 4905 6525 4905 5445
-4 1 0 50 0 14 12 0.0000 4 120 105 5040 6075 L\001
+4 1 0 50 0 14 12 0.0000 4 120 120 5040 6075 L\001
 -6
 -6
 6 5805 5445 6345 6525
@@ -172,8 +49,8 @@
 	 6255 6020 6030 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 6030 5670 6255 5670 6255 6345 6030 6345 6030 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 6145 6222 P\001
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 6255 5670 5805 5670
@@ -181,7 +58,7 @@
 	 5805 6345 6255 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 5805 5445 6255 5445 6255 6525 5805 6525 5805 5445
-4 1 0 50 0 14 12 0.0000 4 120 105 5940 6075 L\001
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 -6
 -6
 6 6705 5445 7245 6525
@@ -191,8 +68,8 @@
 	 7155 6020 6930 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 6930 5670 7155 5670 7155 6345 6930 6345 6930 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 7045 6222 P\001
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 7155 5670 6705 5670
@@ -200,7 +77,7 @@
 	 6705 6345 7155 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 6705 5445 7155 5445 7155 6525 6705 6525 6705 5445
-4 1 0 50 0 14 12 0.0000 4 120 105 6840 6075 L\001
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 -6
 -6
 6 450 5580 810 6390
@@ -208,8 +85,8 @@
 	 720 6020 495 6020
 2 2 0 2 0 4 53 0 20 0.000 0 0 -1 0 0 5
 	 495 5670 720 5670 720 6345 495 6345 495 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 610 6222 P\001
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 -6
 6 1170 5445 1710 6525
 6 1170 5445 1710 6525
@@ -218,8 +95,8 @@
 	 1620 6020 1395 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 1395 5670 1620 5670 1620 6345 1395 6345 1395 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 1510 6222 P\001
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 1620 5670 1170 5670
@@ -227,7 +104,7 @@
 	 1170 6345 1620 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 1170 5445 1620 5445 1620 6525 1170 6525 1170 5445
-4 1 0 50 0 14 12 0.0000 4 120 105 1305 6075 L\001
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 -6
 -6
 6 2070 5445 2610 6525
@@ -237,8 +114,8 @@
 	 2520 6020 2295 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 2295 5670 2520 5670 2520 6345 2295 6345 2295 5670
-4 1 0 50 0 14 10 0.0000 4 90 90 2410 6222 P\001
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 2520 5670 2070 5670
@@ -246,7 +123,7 @@
 	 2070 6345 2520 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 2070 5445 2520 5445 2520 6525 2070 6525 2070 5445
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 -6
 -6
 6 2970 5445 3510 6525
@@ -256,8 +133,8 @@
 	 3420 6020 3195 6020
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 3195 5670 3420 5670 3420 6345 3195 6345 3195 5670
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 3420 5670 2970 5670
@@ -265,7 +142,7 @@
 	 2970 6345 3420 6345
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 2970 5445 3420 5445 3420 6525 2970 6525 2970 5445
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 -6
 -6
 6 720 3420 1080 4230
@@ -273,24 +150,24 @@
 	 990 3860 765 3860
 2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
 	 765 3510 990 3510 990 4185 765 4185 765 3510
-4 1 0 50 0 14 10 0.0000 4 90 90 880 4062 P\001
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 6 2700 3420 3060 4230
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 2970 3860 2745 3860
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
 	 2745 3510 2970 3510 2970 4185 2745 4185 2745 3510
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 -6
 6 1620 3465 1935 4230
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 1890 3860 1665 3860
 2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 1665 3510 1890 3510 1890 4185 1665 4185 1665 3510
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 -6
 6 10485 3330 11025 4410
 6 10665 3465 11025 4275
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 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 10935 3555 10485 3555
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 	 10485 4230 10935 4230
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 10485 3330 10935 3330 10935 4410 10485 4410 10485 3330
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 -6
 6 7110 3105 7650 4185
 6 7110 3105 7650 4185
@@ -316,8 +193,8 @@
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 	 7335 3330 7560 3330 7560 4005 7335 4005 7335 3330
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 7560 3330 7110 3330
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 	 7110 4005 7560 4005
 2 2 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 5
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 -6
 -6
 6 8010 3105 8550 4185
@@ -335,8 +212,8 @@
 	 8460 3680 8235 3680
 2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 8460 3330 8010 3330
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 	 8010 4005 8460 4005
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 -6
 -6
 6 9315 990 12195 2160
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 	 9945 1520 9720 1520
 2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
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 -6
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 10935 1520 10710 1520
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 	 10665 1710 9945 1710
 	 0.000 0.000
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 -6
 6 6345 1080 6705 1890
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 6615 1520 6390 1520
 2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
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 -6
 6 7335 1080 7695 1890
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 7605 1520 7380 1520
 2 2 0 2 0 6 52 0 20 0.000 0 0 -1 0 0 5
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 -6
 6 8325 1080 8685 1890
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 8595 1520 8370 1520
 2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 8370 1170 8595 1170 8595 1845 8370 1845 8370 1170
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 -6
 6 3870 1215 4185 1980
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 4140 1610 3915 1610
 2 2 0 2 0 2 53 0 20 0.000 0 0 -1 0 0 5
 	 3915 1260 4140 1260 4140 1935 3915 1935 3915 1260
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 -6
 6 4770 1215 5085 1980
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 5040 1610 4815 1610
 2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
 	 4815 1260 5040 1260 5040 1935 4815 1935 4815 1260
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 -6
 6 2205 990 2925 2160
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
@@ -448,24 +325,44 @@
 	1 1 1.00 60.00 120.00
 	 2655 1755 2880 1755 2880 2160 2205 2160 2205 1755 2430 1755
 	 0.000 1.000 1.000 1.000 1.000 0.000
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 -6
 6 525 1350 1455 1830
 2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
 	 540 1590 1440 1590
 2 2 0 2 0 7 50 0 -1 0.000 0 0 -1 0 0 5
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-4 1 0 50 0 14 10 0.0000 4 105 630 990 1545 list *N\001
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+4 1 0 50 0 14 10 0.0000 4 105 735 990 1770 list *P\001
 -6
-2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
-	 3330 2475 6435 2475 6435 4500 3330 4500 3330 2475
+6 4815 3420 5175 4230
+2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
+	 5085 3860 4860 3860
+2 2 0 2 0 7 53 0 20 0.000 0 0 -1 0 0 5
+	 4860 3510 5085 3510 5085 4185 4860 4185 4860 3510
+4 1 0 50 0 14 10 0.0000 4 105 105 4975 4062 P\001
+4 1 0 50 0 14 10 0.0000 4 105 105 4973 3735 N\001
+-6
+6 5715 3285 6390 4410
+2 1 0 1 0 7 50 0 -1 0.000 0 0 -1 0 0 2
+	 6165 3860 5940 3860
+2 2 0 2 0 6 53 0 20 0.000 0 0 -1 0 0 5
+	 5940 3510 6165 3510 6165 4185 5940 4185 5940 3510
+3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
+	1 1 1.00 60.00 120.00
+	 6165 3690 6390 3690 6390 3285 5715 3285 5715 3690 5940 3690
+	 0.000 1.000 1.000 1.000 1.000 0.000
+3 0 0 1 0 7 50 0 -1 0.000 0 1 0 6
+	1 1 1.00 60.00 120.00
+	 6165 4005 6390 4005 6390 4410 5715 4410 5715 4005 5940 4005
+	 0.000 1.000 1.000 1.000 1.000 0.000
+4 1 0 50 0 14 10 0.0000 4 105 105 6055 4062 P\001
+4 1 0 50 0 14 10 0.0000 4 105 105 6053 3735 N\001
+-6
 2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
 	 4050 4725 7605 4725 7605 6840 4050 6840 4050 4725
 2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
-	 12600 6840 12600 4725 7785 4725 7785 6840 12600 6840
-2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
 	 315 4725 3870 4725 3870 6840 315 6840 315 4725
 2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
 	 3150 4500 315 4500 315 2475 3150 2475 3150 4500
@@ -489,6 +386,10 @@
 	 1845 270 3240 270 3240 2250 1845 2250 1845 270
 2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
 	 315 270 1620 270 1620 2250 315 2250 315 270
+2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
+	 3330 2475 6435 2475 6435 4500 3330 4500 3330 2475
+2 4 0 1 0 7 50 0 -1 0.000 0 0 7 0 0 5
+	 12285 6840 12285 4725 7785 4725 7785 6840 12285 6840
 3 0 0 1 0 7 50 0 -1 0.000 0 1 0 2
 	1 1 1.00 60.00 120.00
 	 4230 3690 4860 3690
@@ -499,11 +400,6 @@
 	 0.000 0.000
 3 0 0 1 0 7 50 0 -1 0.000 0 1 0 7
 	1 1 1.00 60.00 120.00
-	 5130 3690 5580 3690 5580 3240 3600 3240 3600 3690 3780 3690
-	 3960 3690
-	 0.000 1.000 1.000 1.000 1.000 1.000 0.000
-3 0 0 1 0 7 50 0 -1 0.000 0 1 0 7
-	1 1 1.00 60.00 120.00
 	 3960 4050 3780 4050 3600 4050 3600 4410 5580 4410 5580 4050
 	 5130 4050
 	 0.000 1.000 1.000 1.000 1.000 1.000 0.000
@@ -655,44 +551,49 @@
 	 3870 1800 3690 1800 3510 1800 3510 2160 5490 2160 5490 1800
 	 5040 1800
 	 0.000 1.000 1.000 1.000 1.000 1.000 0.000
-4 1 0 50 0 14 10 0.0000 4 135 3240 5805 4950 Asymmetrical list starting at R(red)\001
-4 0 0 50 0 12 10 0.0000 4 135 3780 7875 5715 - FOREACH_ITEM(it, R, end, struct foo*, L)\001
-4 0 0 50 0 12 10 0.0000 4 105 2610 7875 5490 - last element has R->P == &L\001
-4 1 0 50 0 14 10 0.0000 4 135 3510 10215 4950 Symmetrical lists vs Asymmetrical lists\001
-4 0 0 50 0 12 10 0.0000 4 135 4680 7875 6165 - FOREACH_ITEM_SAFE(it, bck, R, end, struct foo*, L)\001
-4 0 0 50 0 12 10 0.0000 4 135 4500 7875 6390   does the same except that <bck> allows to delete\001
-4 0 0 50 0 12 10 0.0000 4 135 2340 7875 6570   any node, including <it>\001
-4 1 0 50 0 12 10 0.0000 4 135 450 5130 5355 foo_0\001
-4 1 0 50 0 12 10 0.0000 4 135 450 6030 5355 foo_1\001
-4 1 0 50 0 12 10 0.0000 4 135 450 6930 5355 foo_2\001
-4 1 0 50 0 14 10 0.0000 4 135 3150 2070 4950 Symmetrical list starting at R(red)\001
-4 1 0 50 0 12 10 0.0000 4 135 450 3195 5355 foo_2\001
-4 1 0 50 0 12 10 0.0000 4 135 450 2295 5355 foo_1\001
-4 1 0 50 0 12 10 0.0000 4 135 450 1395 5355 foo_0\001
-4 1 0 50 0 12 10 0.0000 4 105 270 9855 3420 foo\001
-4 1 0 50 0 12 10 0.0000 4 90 90 9990 3825 E\001
-4 1 0 50 0 12 10 0.0000 4 135 2520 4905 3015 Replaces W with Y, returns W\001
-4 1 0 50 0 14 10 0.0000 4 135 1440 7785 2655 Linking elements\001
-4 1 0 50 0 12 10 0.0000 4 135 450 8235 3015 foo_1\001
-4 1 0 50 0 12 10 0.0000 4 135 450 7335 3015 foo_0\001
-4 1 0 50 0 12 10 0.0000 4 135 3060 7425 810 adds Y(yellow) just after G(green)\001
-4 1 0 50 0 12 10 0.0000 4 135 1170 4500 855 adds W(white)\001
-4 1 0 50 0 12 10 0.0000 4 135 2700 10755 810 adds Y at the queue (before G)\001
-4 1 0 50 0 12 12 0.0000 4 165 630 990 1080 P=prev\001
-4 1 0 50 0 14 12 0.0000 4 135 1155 945 585 struct list\001
-4 1 0 50 0 12 12 0.0000 4 120 630 990 855 N=next\001
-4 1 0 50 0 12 10 0.0000 4 105 1080 2565 900 Terminates G\001
-4 1 0 50 0 14 10 0.0000 4 105 1260 2565 675 struct list *G\001
-4 1 0 50 0 14 10 0.0000 4 135 1260 2565 495 LIST_INIT(G):G\001
-4 1 0 50 0 14 10 0.0000 4 135 1350 4500 495 LIST_ADD(G,W):W\001
-4 1 0 50 0 14 10 0.0000 4 135 1440 4500 675 LIST_ADDQ(G,W):W\001
-4 1 0 50 0 14 10 0.0000 4 135 1350 7425 540 LIST_ADD(G,Y):Y\001
-4 1 0 50 0 14 10 0.0000 4 135 1440 10755 540 LIST_ADDQ(G,Y):Y\001
-4 1 0 50 0 12 10 0.0000 4 135 2610 1755 3060 unlinks and returns Y(yellow)\001
-4 1 0 50 0 14 10 0.0000 4 135 1170 1755 2790 LIST_DEL(Y):Y\001
-4 1 0 50 0 14 10 0.0000 4 135 1440 4905 2745 LIST_RIWI(W,Y):W\001
-4 1 0 50 0 12 10 0.0000 4 135 2790 10665 3105 containing header E as member L\001
-4 1 0 50 0 14 10 0.0000 4 135 2880 10665 2700 foo=LIST_ELEM(E, struct foo*, L)\001
-4 1 0 50 0 12 10 0.0000 4 135 2880 10665 2925 Returns a pointer to struct foo*\001
-4 0 0 50 0 12 10 0.0000 4 135 2610 7875 5265 - both are empty if R->P == R\001
-4 0 0 50 0 12 10 0.0000 4 135 3960 7875 5940   iterates <it> through foo{0,1,2} and stops\001
+3 0 0 1 0 7 50 0 -1 0.000 0 1 0 7
+	1 1 1.00 60.00 120.00
+	 5130 3690 5580 3690 5580 3240 3600 3240 3600 3690 3780 3690
+	 3960 3690
+	 0.000 1.000 1.000 1.000 1.000 1.000 0.000
+4 1 0 50 0 14 10 0.0000 4 135 3780 5805 4950 Asymmetrical list starting at R(red)\001
+4 1 0 50 0 14 10 0.0000 4 135 4095 10215 4950 Symmetrical lists vs Asymmetrical lists\001
+4 1 0 50 0 12 10 0.0000 4 135 525 5130 5355 foo_0\001
+4 1 0 50 0 12 10 0.0000 4 135 525 6030 5355 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 525 6930 5355 foo_2\001
+4 1 0 50 0 14 10 0.0000 4 135 3675 2070 4950 Symmetrical list starting at R(red)\001
+4 1 0 50 0 12 10 0.0000 4 135 525 3195 5355 foo_2\001
+4 1 0 50 0 12 10 0.0000 4 135 525 2295 5355 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 525 1395 5355 foo_0\001
+4 1 0 50 0 12 10 0.0000 4 105 315 9855 3420 foo\001
+4 1 0 50 0 12 10 0.0000 4 105 105 9990 3825 E\001
+4 1 0 50 0 14 10 0.0000 4 135 1680 7785 2655 Linking elements\001
+4 1 0 50 0 12 10 0.0000 4 135 525 8235 3015 foo_1\001
+4 1 0 50 0 12 10 0.0000 4 135 525 7335 3015 foo_0\001
+4 1 0 50 0 14 10 0.0000 4 105 1470 2565 675 struct list *G\001
+4 1 0 50 0 14 10 0.0000 4 135 1470 2565 495 LIST_INIT(G):G\001
+4 1 0 50 0 14 10 0.0000 4 135 1890 4500 495 LIST_INSERT(G,W):W\001
+4 1 0 50 0 14 10 0.0000 4 135 3360 10665 2700 foo=LIST_ELEM(E, struct foo*, L)\001
+4 1 0 50 0 14 10 0.0000 4 135 1890 4500 675 LIST_APPEND(G,W):W\001
+4 1 0 50 0 14 10 0.0000 4 135 1890 7425 540 LIST_INSERT(G,Y):Y\001
+4 1 0 50 0 14 10 0.0000 4 135 1890 10755 540 LIST_APPEND(G,Y):Y\001
+4 1 0 50 0 14 10 0.0000 4 135 1680 1755 2790 LIST_DELETE(Y):Y\001
+4 1 0 50 0 14 10 0.0000 4 135 1890 4905 2745 LIST_DEL_INIT(Y):Y\001
+4 1 0 50 0 12 9 0.0000 4 120 2880 10665 2925 Returns a pointer to struct foo*\001
+4 1 0 50 0 12 9 0.0000 4 120 2790 10665 3105 containing header E as member L\001
+4 1 0 50 0 12 9 0.0000 4 120 2700 10755 810 adds Y at the queue (before G)\001
+4 1 0 50 0 12 9 0.0000 4 120 3060 7425 810 adds Y(yellow) just after G(green)\001
+4 1 0 50 0 12 9 0.0000 4 120 1170 4500 855 adds W(white)\001
+4 1 0 50 0 12 9 0.0000 4 105 1080 2565 900 Terminates G\001
+4 1 0 50 0 12 9 0.0000 4 90 540 990 855 N=next\001
+4 1 0 50 0 12 9 0.0000 4 105 540 990 1080 P=prev\001
+4 1 0 50 0 12 9 0.0000 4 120 2610 1755 3060 unlinks and returns Y(yellow)\001
+4 1 0 50 0 12 9 0.0000 4 120 2610 4905 3060 unlinks, inits, and returns Y\001
+4 0 0 50 0 12 8 0.0000 4 105 2175 7875 5265 - both are empty if R->P == R\001
+4 0 0 50 0 12 8 0.0000 4 90 2175 7875 5490 - last element has R->P == &L\001
+4 0 0 50 0 12 8 0.0000 4 105 3150 7875 5715 - FOREACH_ITEM(it, R, end, struct foo*, L)\001
+4 0 0 50 0 12 8 0.0000 4 105 3300 7875 5940   iterates <it> through foo{0,1,2} and stops\001
+4 0 0 50 0 12 8 0.0000 4 105 3900 7875 6165 - FOREACH_ITEM_SAFE(it, bck, R, end, struct foo*, L)\001
+4 0 0 50 0 12 8 0.0000 4 105 3750 7875 6390   does the same except that <bck> allows to delete\001
+4 0 0 50 0 12 8 0.0000 4 105 1950 7875 6570   any node, including <it>\001
+4 1 0 50 0 14 11 0.0000 4 135 1155 945 585 struct list\001
diff --git a/doc/internals/list.png b/doc/internals/list.png
new file mode 100644
index 0000000..ec41a6b
--- /dev/null
+++ b/doc/internals/list.png
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