[MERGE] 4% faster to incremental commit

[Robert Collins]

This is the tweaked patch, with a bug in bzr.dev for pointless commits
of nested trees fix (Ian's questions about whether my code had a bug had
me look for this, and it was broken in bzr.dev).

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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