RO/Wdg/GrayImageDispWdg.py: - Overhauled the Scale menu. It now contains Linear   and several flavors of ArcSinh. - Added command-drag to adjust brightness and (in essence) contrast. - Added command-double-click to restore default brightness and contrast. - Modified the algorithm for display; scaledArr now goes from   0-256 for input values dataDispMin-Max. This eliminates two   attributes and makes it easier to adjust black and white levels   via dragging the mouse.
RO/Wdg/GrayImageDispWdg.py:
- Overhauled the Scale menu. It now contains Linear
  and several flavors of ArcSinh.
- Added command-drag to adjust brightness and (in essence) contrast.
- Added command-double-click to restore default brightness and contrast.
- Modified the algorithm for display; scaledArr now goes from
  0-256 for input values dataDispMin-Max. This eliminates two
  attributes and makes it easier to adjust black and white levels
  via dragging the mouse.



git-svn-id: a38512e6531051f4ba6aaa1c8358347ddeca2e1b@117135 b00c9580-4927-0410-8824-811d448ea4c7

r-owen/stui,r-owen/stui