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

[John Arbash Meinel]

John Arbash Meinel wrote:
> After the changes Larstiq and I did, to make .bzr/branch/parent a
> relative path, it is possible to have paths that are not accessible or
> valid from a different access mechanism.
> 
> https://launchpad.net/products/bzr/+bug/52976
> 
> Typically this manifests itself when someone does a local branch to a
> publicly served location. So the relative path is their filesystem, and
> only a portion of this is served by http.

...

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.

Seeking a +1 to merge this for 0.9.

John
=:->
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