Fixed tests by adding tolerance to output cubes for individual DNs, so as to...

Fixed tests by adding tolerance to output cubes for individual DNs, so as to fix problems with different architectures and OSs

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3182 41f8697f-d340-4b68-9986-7bafba869bb8