isis2std.xml: Added minimum and maximum input stretch values and output file...

isis2std.xml: Added minimum and maximum input stretch values and output file name to the output log. fixes #761 

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4159 41f8697f-d340-4b68-9986-7bafba869bb8