[MERGE] versionedfile.py code cleanups

[Aaron Bentley]

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Ian Clatworthy wrote:
> Martin Pool wrote:
>> Martin Pool has voted approve.
>> Status is now: Approved
> 
> Thanks. I'll merge this with a tweak though - _apply_delta() will be
> moved into knit.py as discussed with Aaron and Robert on IRC. I'll make
> it a static method of KnitVersionedFile (as that's the only place it's
> used).
> 
> If anyone disagrees, speak up soon. :-)

Well, we discussed sticking it somewhere like KnitContent, the point
being that it doesn't have anything to do with the versionedfile interface.

Aaron
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