[MERGE] Redo annotate more simply, using just the public interfaces for VersionedFiles.

[Robert Collins]

This builds on the stackings knits patch to allow annotate to work.

It's a lot simpler than the previous code [John suggested this
approach :P].

It likely has higher memory use, but shouldn't AFAICT be slower, because
this will issue a single get_record_stream call (and that should be
doing optimisations anyway).

-Rob
-- 
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