CLEANUP: lists/tree-wide: rename some list operations to avoid some confusion

The current "ADD" vs "ADDQ" is confusing because when thinking in terms
of appending at the end of a list, "ADD" naturally comes to mind, but
here it does the opposite, it inserts. Several times already it's been
incorrectly used where ADDQ was expected, the latest of which was a
fortunate accident explained in 6fa922562 ("CLEANUP: stream: explain
why we queue the stream at the head of the server list").

Let's use more explicit (but slightly longer) names now:

   LIST_ADD        ->       LIST_INSERT
   LIST_ADDQ       ->       LIST_APPEND
   LIST_ADDED      ->       LIST_INLIST
   LIST_DEL        ->       LIST_DELETE

The same is true for MT_LISTs, including their "TRY" variant.
LIST_DEL_INIT keeps its short name to encourage to use it instead of the
lazier LIST_DELETE which is often less safe.

The change is large (~674 non-comment entries) but is mechanical enough
to remain safe. No permutation was performed, so any out-of-tree code
can easily map older names to new ones.

The list doc was updated.
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
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 	 0.000 1.000 1.000 1.000 1.000 0.000
-4 1 0 50 0 14 10 0.0000 4 90 90 2545 1812 P\001
-4 1 0 50 0 14 10 0.0000 4 90 90 2543 1485 N\001
+4 1 0 50 0 14 10 0.0000 4 105 105 2545 1812 P\001
+4 1 0 50 0 14 10 0.0000 4 105 105 2543 1485 N\001
 -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
 	 540 1365 1440 1365 1440 1815 540 1815 540 1365
-4 1 0 50 0 14 10 0.0000 4 105 630 990 1545 list *N\001
-4 1 0 50 0 14 10 0.0000 4 105 630 990 1770 list *P\001
+4 1 0 50 0 14 10 0.0000 4 105 735 990 1545 list *N\001
+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