Changed the name of several unit test truth datas because decon changed part...

Changed the name of several unit test truth datas because decon changed part of its name, also deleted some old unused truthdata, such as truth.Darwin.powerpc

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2005 41f8697f-d340-4b68-9986-7bafba869bb8