[MERGE] Remove knit caches

[Robert Collins]

On Tue, 2006-06-27 at 09:06 -0400, Aaron Bentley wrote:
> 
> 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.

This was done by me when exploring optimisation routes for the same
problem. 

What I wanted to achieve was direct generation of deltas from weaves, so
we could just insert straight into the knit with no parent information
needed. The opaque hint given by add_lines is indeed the most likely
route to reoptimise now.

I was very sick at the time I did this, on the last trip to London, so
I'm a little hazy about it :(

Rob

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