TreeTransform progress

[Aaron Bentley]

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I continue to work on TreeTransform.  So far, I have implemented branch
clone operations, and I'll be working on revert next.

The good news is that transform-based branch cloning on kernel-sized
trees is 2.3 times as fast as merge-based.  The bad news is that it's
still 8 minutes.  (And that's on a 1-commit history)

With transform:
real    8m20.780s
user    1m41.197s
sys     0m10.034s

With merge:
real    19m18.038s
user    3m4.188s
sys     0m15.078s

It looks like most of this time is spent waiting for IO.  So one way to
make it faster would be better compression of the stores.

Aaron
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