[MERGE][0.15] Speed up 'bzr status' in xml trees

[Aaron Bentley]

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John Arbash Meinel wrote:

> True. Though I don't expect a huge speedup. I guess for 'commit' it
> would be a bit faster, because we would only have 1 serialize call,
> rather than 2.

> I guess I would rather use format 6 for 0.15, since WT3 is otherwise
> unaltered from earlier formats.

I don't see any point in using format 6.  The only difference between it
and 7 is that 7 supports tree-references.  5 on the other hand is a
match for the knit and weave inventory formats, so you do save some time
whevenever you need to update the basis

You realize that the cached-basis code is designed to be robust, right?
   You can put garbage there, or anything you like, and it won't fall over.

Aaron
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