Fix: addition of status bar for interactive only

- was adding a status bar based on "save" argument rather than
  "interactive" argument
Added extend option
Added extend to all plot routines
Change 'q' to close from exit

- 'q' now closes active figure
- 'Q' calls exit()
Added ice9 algorithm for creating masks
Fix for xycompare with stats
Added 'dunneRainbow' colormap

- Registers the colormap as well as returns it.