[BUG] circular import problems

[John Arbash Meinel]

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Right now we have a bug in our import dependencies.

Specifically, 'bzrlib/tree.py' imports RevisionTree from
bzrlib/revisiontree.py

But bzrlib/revisiontree must import bzrlib.tree to get the base-level
Tree implementation.

Which means that this fails:

python -c 'import bzrlib.revisiontree'

fails because revision tree imports tree, which tries to import
revisiontree but RevisionTree is not defined yet.

I'm not sure how exactly we can get around this, and maintain
compatibility. (I think if revisiontree.py did:
from bzrlib.tree import Tree, it would work).

It might be worthwhile to break compatibility, though. I'm not sure how
to deprecate something like this.

John
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