Added error checks to several fread(...) calls due to the compiler warnings...

Added error checks to several fread(...) calls due to the compiler warnings that cropped up on prog3 because return values were being ignored. Also removed tabs from file so that I could commit it.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2645 41f8697f-d340-4b68-9986-7bafba869bb8