[MERGE][bug 115343] Allow 'bzr branch -r revid:xxx' to branch any revision in ancestry

[Aaron Bentley]

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John Arbash Meinel wrote:
> The attached patch makes "BzrBranch6" also support it. I only test that
> you can branch anything in Ancestry (not just in your repository) since
> that seemed more realistic for foreign branches. (And if we ever
> implement any sort of auto-gc).

I think I would prefer to ensure you can branch from anything in your
repository, not just in your ancestry.  This allows you to restore
branches that you may have deleted by accident.

Aaron
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