[MERGE] Fix InterBranch.pull tests.

[Jelmer Vernooij]

The attached patch moves the pull logic from Branch.pull() to InterBranch.pull().
This makes it possible to register optimized versions for pulling between 
particular branches. For example, I have a version of InterBranch.pull() for 
pulling from Subversion branches into Bazaar branches that changes the complexityfrom O(history) to O(missing_revisions).

wrt tests, I have for now just added tests for InterBranch.pull() as already 
existed for Branch.pull(). Perhaps the number of tests for Branch.pull() can be 
trimmed now.

Cheers,

Jelmer
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