fix all the known crashes while dragging cell markers in the top ruler,
a cell marker can't be dragged across it's neighbours,
some left ruler cleanup

CVS:
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CVS: Enter Log.  Lines beginning with `CVS:' are removed automatically
CVS:
CVS: Committing in .
CVS:
CVS: Modified Files:
CVS:    ap_LeftRuler.cpp ap_TopRuler.cpp
CVS:
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