Qtool improvements from xmas break

Since the tool is being rewritten right now, I am not sure how necessary this is, but here are the qtool changes I worked on during the last week of xmas break.

- Label in log viewer displays currently loaded color table -- Issue #400
- Automatically loads (and serializes) last color table used on start up -- Issue #395
- Label in color table creator displays currently loaded color table
- Depending on whether the user is looking at top image or bottom image in color table creator, a different color table is loaded -- Issue #401