Made a small modification to the code in FindRed(...) that created a Pvl...

Made a small modification to the code in FindRed(...) that created a Pvl object for each file in the file list. FileList's overloaded '[]' operator that was used inside of the call to Filename's constructor confused the compiler on Ubuntu 10.04 systems. References #311.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2978 41f8697f-d340-4b68-9986-7bafba869bb8