[merge] remove deprecated things

[Aaron Bentley]

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Martin Pool wrote:
> This removes some pretty old deprecated code, from 0.8 through 0.11,
> and the tests that covered them.

Yay!

> The only part of this that might be controversial is that this removes
> VersionedFile.walk...It
> is not called aside from the tests, and since it only relates to the
> very old weave code and is just supported for compatability(?) by
> knits I think it's safe to remove.

IIRC, the last user of VersionedFile.walk was VersionedFile.plan_merge.

Aaron
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