Automagically detect presence of proprietary Kakadu library and set...

Automagically detect presence of proprietary Kakadu library and set conditional compile appropriately; Fix conditional compilation issues when Kakadu package is not present in JP2 classes; references #770

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4195 41f8697f-d340-4b68-9986-7bafba869bb8