RO/Wdg/GrayImageDispWdg.py: - Fixed problem with positions being messed up by scroll   (these were a known problem introduced in the last update). - Improved zoom to try to retain center. Due to limitations   in Tk scrolling (and my reluctance to try to hack around them),   this fails when the image is smaller than its enclosing frame.
RO/Wdg/GrayImageDispWdg.py:
- Fixed problem with positions being messed up by scroll
  (these were a known problem introduced in the last update).
- Improved zoom to try to retain center. Due to limitations
  in Tk scrolling (and my reluctance to try to hack around them),
  this fails when the image is smaller than its enclosing frame.


r-owen/TUI,r-owen/TUI