In qview, the special pixel colorization tool's settings won't be forgotten...

In qview, the special pixel colorization tool's settings won't be forgotten when restretching. Also, images that are opened after using this tool will now take on the appropriate colors. Fixes #684.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4517 41f8697f-d340-4b68-9986-7bafba869bb8