[MERGE] BranchBuilder updates

[John Arbash Meinel]

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Sorry for spamming patches to this, but the discussion with Aaron
reminded me that holding locks over multiple commits really does help.

So this patch adds "start_series()" and "finish_series()" to hold the
locks (and MemoryTree) open for a while.

It makes some of my tests drop from 90ms => 45ms or so.

The real improvement overall is just using it in the first place. As it
changes my test time from about 500ms => 90ms. (The problem seems to be
that on win32 grabbing a disk lock is expensive on ntfs for whatever
reason.)

John
=:->
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