[BUG?] revisiontree's root node has no revision attribute set

[Aaron Bentley]

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John Arbash Meinel wrote:
> I think for the nested tree work, we would want it to have the revision
> id of the last commit. But that makes it different from all the other
> directory nodes.

For nested by-reference trees, we'll need a new node type, say
ChildRoot.  So in the child, the root would be a normal directory, but
in the parent, it would be a ChildRoot, and its .revision could come
from WorkingTree.last_revision.

I don't think we need consistency between the ChildRoot.revision and the
InventoryDirectory.revision, and I'd prefer to make the
InventoryDirectory for the root behave like all other InventoryDirectories.

Aaron
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