[PATCH] branch and pull

[Aaron Bentley]

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This patch adds 'branch' and 'pull' commands.  Currently, they work only
with local branches, but they should support remote branches once remote
branches are complete.

'branch' is much slower than cp -a, because it operates on at highter
level.  It's CPU-bound at the beginning and I imagine this due to XML
parsing.

'pull' updates the revision stores, then does a three-way merge on the
working directory, to ensure the working copy has the latest upstream
changes.  Local changes will be preserved, but may produce conflicts.

Branch and pull are history-based, and copy the bare minimum needed to
produce all the revisions in a tree's history.  So if you've been
removing revisions from your history, you can use branch to optimize
your storage.  Slightly.

Aaron
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