[MERGE] Stacked knits

[Aaron Bentley]

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Robert Collins wrote:
> This patch teaches KnitVersionedFiles how to stack on any other
> VersionedFiles object(s). It doesn't [yet] support annotations across
> such boundaries, but as it should be sufficient to get stacked branches
> up and running I thought I would send it in for review.

In case it's not clear, "knits" refers to a data encoding technique, not
to a repository format.  Both pack and knit repositories use "knit"
encoding.

In other words, this should enable pack repositories to stack on top of
other arbitrary repositories.

Aaron
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