[merge] allow 'bzr branch' even if parent is not accessible

[Aaron Bentley]

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John Arbash Meinel wrote:
> Attached is an updated version of the patch. Now 'branch.get_parent()'
> will raise an InaccessibleParent error if it cannot return a full url to
> the parent.
> And then 'copy_content_into()' handles that exception when appropriate.
> 
> I've added tests that all branch implementations do the right thing.

To me, this looks like you've taken something that used to work fine in
0.8 and made it fail in 0.9.

In 0.8, I could access a branch by sftp, and if its parent was a local
path, I could also access its parent.

So I'm -0.

Aaron
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