Branch for format 7

[Aaron Bentley]

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Robert Collins wrote:
| When we start the split into checkout, branch and repository, I figure
| we'll leave .bzr/branch-format behind with a value of (say) 9, and
| introduce new format values for each of the other three elements.

Once branch metadata is moved into a subdirectory, 'branch-format' isn't
an accurate filename.  What do you think of 'meta-format'?

Aaron
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