Added Eric Hyer's final changes to this application that allow users to load a...

Added Eric Hyer's final changes to this application that allow users to load a cube list and have cube filenames display instead of cube serial numbers. 'Cube serial number' filter is now called 'Image ID', as users may be either filtering on cube serial numbers or cube filenames. Fixes #304.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3925 41f8697f-d340-4b68-9986-7bafba869bb8