#6 generic object media test

[Mark Lentczner]

Currently, the only tests of the object interface are specific
to particular media.

We need a set of tests that can be pointed at any media
and throughly test that the media correctly implements the
ObjectPointer and ObjectManager protocol.

This might be tricky since media aren't required to
implement all the features (for example, they may not
allow setting of access flags). So, the test will have to
parameterized.

Of course, this will force us to do what we should have
done: well define what is and isn't optional!