Removed old related file group code and marked tests that will probably
carry over in a modified form as pending. At this point enough is ripped
out that the remainder of the tests pass.

Now it should be a matter of adapting the tests and adding new tests
as appropriate, then rebuilding the functionality that we need. There
may also be some test code that needs to be modified or removed.
More revision of file group relations. The tests pass now, but there
are still a couple of areas where we may want to change things up a bit.
Modify some stuff around related file group display.