TODO.slip-multi-movfeat: plan for dealing with the double slip

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+* new section in ours.wiring for breaking up S0 S1 S2 S3 into
+  P0Q0V0R0 et al.
+
+* data2safety reads that and computes most things to have the
+  exploded version; the exception is layout-data.c SegPosCombInfo.pname
+
+* movpos.c needs to be modified to cope with mixed MovPosChanges
+  split MovPosChange into two structs, Change which is per-method
+  and MovPosChange which has a set of Changes one per relevant method
+
+  Methods have to call a new change_done which is a bit like
+  motion_done but only does one Change and considers whether the
+  whole MovPosComb is done.
+
+  evaluate should have a cost or a time or something rather than
+  just a count since wagglers are nearly free and points are not
+  and we always want to change a waggler rather than a point
+
+* There may be some fallout from the segment movfeat splitting
+  eg in the gui or gui plan displayer.