Branch for format 7

[Aaron Bentley]

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John Arbash Meinel wrote:

> It seems '.bzr/meta-format' is unnecessary. Though it might be easier to
> maintain forward compatibility.

I don't exepect the meta-format would change often at all.  But if we
didn't have meta-format versions, what would we do if we decided that
./bzr/checkout should be changed to ./bzr/workingtree ?

Aaron
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