refs #7472. New unit test script.

Covering cleanup and starting work on coAdd.
refs #7472. Adding tests for getGroup.

Lots of options for using getGroup. Cover the specific 'whattoget' arguments.
refs #7472. Check log error codes.
refs #7472. Make tests run quicker

Avoid cyclic loading/deleting of workspaces via the constructor/destructor. Tests now run in 1/4 the time.
refs #7472. Fix merge conflict.