[MERGE] Nested trees: CompositeTree

[Aaron Bentley]

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Hi all,

This patch implements CompositeTree, which provides a Tree interface
that combines a Tree with its by-reference subtrees.  Upcoming patches
will use CompositeTree to provide nested tree support in commands like
diff and status.

It supports both RevisionTrees and WorkingTrees.  It does not claim to
be a complete Tree implementation-- it is driven by the needs of the
commands it supports.

Second, it implements NestedTrees, which is the native, low-friction
interface to a set of nested trees.  This will become the preferred
interface, especially for commands that perform writes.

It implements CompositeInventory, but I'm hoping our codebase no longer
has a strict requirement for Trees to have inventories, and that we can
eliminate it later.

To an extent, this code is a work-in-progress, but it does pass all
tests, even with the later threads merged in, so I think it's ready for
review.

Aaron
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