[MERGE] Initialize before transfer for BzrDir.clone() and sprout()

[John Arbash Meinel]

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The attached patch changes BzrDir.clone() and BzrDir.sprout() so that
they create the target branch and repository first, and then copy the
data into it.

The biggest effect of this, is to close
https://bugs.launchpad.net/products/bzr/+bug/45504

Which means that when people push new branches into Launchpad, hitting
^C doesn't totally mess them up. Which helps avoid bugs like:
https://bugs.launchpad.net/bugs/53340
and
https://bugs.launchpad.net/bugs/30576

There is still a short window where those can be triggered, but at least
it is *much* smaller now.

This also has an effect on 'bzr branch' so that the transfer can be
resumed by simply "cd target; bzr pull".

And as a side effect of the refactoring, it should fix:
https://bugs.launchpad.net/products/bzr/+bug/50582

But I didn't write tests for that, so I won't guarantee it.


I also removed the deprecated code from Branch.clone(). It was
deprecated it 0.8, and it seemed a reasonable time to clean it up.

John
=:->
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