DOC: add the documentation about internal circular lists
This file was recovered from the first project where it was born 12 years
ago, but it's still convenient to understand how our circular lists work,
so let's add it.
diff --git a/doc/internals/list.fig b/doc/internals/list.fig
new file mode 100644
index 0000000..dc1f4dc
--- /dev/null
+++ b/doc/internals/list.fig
@@ -0,0 +1,698 @@
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+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