(1) There was still one place that dimensional units were not being
printed, which was "setlabel", with both "setlabel size" and
"setlabel offset". This has been fixed.
(2) Fixing (1) surfaced an error in the text helper dialog, which was
not setting units properly when checking the size and offset entries.
(3) Fixed a very long-standing problem in which port labels were showing
up with the "pale" style of a subcell's label being drawn on top
when the parent and child had the same label in exactly the same
position. This was due to a parent-first search resulting in the
child cell being visited last, so its "pale" style label being drawn
last. Added a flag for label searches for display to reverse the
search order, visiting children first and then the parent, so that
the top cell's labels are the last to be drawn.
05561b90f3