Added routine to Makefiles stripping the paths from cube filenames in output...

Added routine to Makefiles stripping the paths from cube filenames in output files, leaving only the basename, for the sake of matching output regardless of where the input data resides (locally or in cpkgs)

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3022 41f8697f-d340-4b68-9986-7bafba869bb8