More cleanup that needs to be done when an interface isremoved

[Ted Lemon]

> For the most part, I think so.  It is probably the most shakey of
> everything I wrote.  Mainly that I have not figured out how "io" objects
> fit into the OMAPI scheme.  I based the destroy on the "create" but found
> that I had to weed out destroying of non-interface objects.

Then it may be wrong.   The I/O object should *get* destroyed when the
underlying object is destroyed.

			       _MelloN_