[MERGE] Use repository format from cloning metadir rather than always the source repository format

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| Hi Robert, Ian,
|
| The attached patch fixes the creation of the remote repository when
| sprouting and creating a shallow branch. It's required for bzr-svn,
| otherwise we end up trying to create a SvnRepository in the target
| bzrdir.
|
| Cheers,
|
| Jelmer
|

Does this patch still preserve the format for all other implementations?
Specifically doing "bzr branch Branch5 new_branch" should not switch to the
default branch format.

I suppose that is supposed to be encapsulated in 'cloning_metadir'? Though I
believe we've had a few bugs where it *doesn't* set .repository_format
correctly. (I believe this is one of the thing that breaks branching over
bzr+ssh from a --rich-root-pack repository).

John
=:->
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