[MERGE] Remove knit caches

[Aaron Bentley]

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Robert Collins wrote:
> On Tue, 2006-06-27 at 09:06 -0400, Aaron Bentley wrote:
> 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 :(

Okay, well it looks to me like it's already being done in
InterVersionedFile.join:

        parent_texts = {}
        try:
...
            for index, version in enumerate(order):
                pb.update('Converting versioned data', index, len(order))
                parent_text = target.add_lines(version,

self.source.get_parents(version),

self.source.get_lines(version),
                                               parent_texts=parent_texts)
                parent_texts[version] = parent_text
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