[MERGE] WorkingTree.merge_from_branch

[Robert Collins]

This patch adds a convenience method 'merge_from_branch' to WorkingTree.

I've added only the minimal functionality for now, but the plan is to
extend this api with portions of merge_inner and builtins.merge that
support library users. This is not a generic merge helper - its specific
to the use case of 'merge_from_branch'.

I've converted the current code base's use of TestCase.merge to use this
api, as its easier to understand and remember - I've also deprecated the
TestCase helper function.

Cheers,
Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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