VikingCamera.h: 2011-05-03 Jeannie Walldren - Added ShutterOpenCloseTimes()...

VikingCamera.h: 2011-05-03 Jeannie Walldren - Added ShutterOpenCloseTimes() method. Updated unitTest to test for new methods. Updated documentation. Added Isis Disclaimer to files. Added NAIF error check to constructor.  

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2353 41f8697f-d340-4b68-9986-7bafba869bb8