[MERGE] Remove knit caches

[Aaron Bentley]

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Robert Collins wrote:
> Conversion of a tree with 8000 inventories has this access pattern:
> insert  rev 0
> insert rev1 reads rev0

VersionedFile.add_lines returns an opaque representation of the inserted
version, which can then be reused as the parent_texts parameter in
subsequent calls.  This sounds like it would solve that case well.  i.e.
when inserting rev1, you'd supply the rev0, so it wouldn't need to be read.

Is there something I'm missing?

Aaron
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