Added support for NAIF DSK shape models. Updated naif include location in...

Added support for NAIF DSK shape models. Updated naif include location in config files so naif includes no longer require a path. Fixes #2035

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@6094 41f8697f-d340-4b68-9986-7bafba869bb8