Added applications apollopaninit and apollopanstitcher and support...

Added applications apollopaninit and apollopanstitcher and support classes/functions for working with Apollo Panoramic images.  Also made changes to Spice and LineScanCameraGroundMap and added ApolloPan camera model.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3914 41f8697f-d340-4b68-9986-7bafba869bb8