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

[Aaron Bentley]

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John Arbash Meinel wrote:
> Oh, and when did we change 'basis-inventory-cache' to use format 7
> instead of format 6?

I changed it when I created my WorkingTree4, which was a WorkingTree3
with the inventory format changed to 7.

It might give a speed boost to switch the basis format back to 5,
because then it can use the repository inventory text verbatim.

> PS> I'm still getting failures for blackbox.test_merge_directive because
> I don't have an SMTP host running on the local machine. Did we only fix
> the non-blackbox test?

Dunno.  I can check.

Aaron
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