Experimental: implement allPanels
Experimental: implement allPanels

1. Maybe ought to be in match.axes instead of main loop.
2. allPanels=T behavior incorrect when axes of middle panels are null:
L and B axes not copied.
3. allPanels=F behavior incorrect when all panels have their own axes:
only panel edges at edge of figure get mirrored.

infotroph/ggplot-ticks