[MERGE] Remove manual notification of transaction finishing on versioned files.

[Robert Collins]

This removes the manual notification need for versioned files, replacing
it with a callback to an arbitrary function; this allows VersionedFiles
to stop tracking 'open' weaves, which will reduce memory pressure when
the use of the api is cleaned up - coming soon :P.

Oh, completely api incompatible.

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