[MERGE] Clean up Branch.sprout

[Aaron Bentley]

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Hi all,

The way BzrBranch.sprout works is a little odd.  It always uses the
source branch's format, even when the target metadir's branch format is
different.

This patch allows the target metadir to control the format.  It is a
prerequisite for my upcoming patch to re-enable stacking policies.

In the process of fixing this, I also had to fix BzrDir5/6 so that
BzrDir.create_branch actually ran BranchFormat.initialize.  I don't know
why it wasn't doing that.

Aaron
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