[MERGE] Add BzrDir.open_repositoryV3

[Robert Collins]

On Thu, 2009-02-26 at 06:28 -0500, Andrew Bennetts wrote:
> 
> How about replacing it with an assertion that it is never replaced
> with 
> a different instance?  Setting the same instance seems harmless, but
> a 
> different one would be a problem.

It will always be a different instance though. (because Branch.open ->
bzrdir.open_repository() -> new instance. Lets chat tomorrow.

-Rob
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