Removed SpacecraftInstrumentId methods from SerialNumberList. Updated its...

Removed SpacecraftInstrumentId methods from SerialNumberList. Updated its documentation, testing, and coding standards compliance. Fixes #3967. Updated documentation and testing for ObservationNumberList. Fixes #3990.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@6769 41f8697f-d340-4b68-9986-7bafba869bb8