Reworked camera model for more thorough IK support for externalized management...

Reworked camera model for more thorough IK support for externalized management of parameters contained therein - results in Version 2 of the WAC camera model

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@442 41f8697f-d340-4b68-9986-7bafba869bb8