[MERGE] Minor fixes for foreign format friendliness.

[Robert Collins]

On Thu, 2007-11-08 at 21:36 -0500, Martin Pool wrote:
> Martin Pool has voted tweak.
> Status is now: Conditionally approved
> Comment:
> That looks like a nice change, but will it break on branch classes that 
> don't provide _get_checkout_format()?

Yes, but no worse than the current test does - I haven't seen a foreign
branch that can pass the current test.

-Rob
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