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Merge in bzr.dev 3801, resolve NEWS

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bzrlib/branch.py
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        # (params) where params is a ChangeBranchTipParams with the members
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        # (branch, old_revno, new_revno, old_revid, new_revid)
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        self['post_change_branch_tip'] = []
 
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        # Introduced in 1.9
 
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        # Invoked when a stacked branch activates its fallback locations and
 
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        # allows the transformation of the url of said location.
 
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        # the api signature is
 
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        # (branch, url) where branch is the branch having its fallback
 
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        # location activated and url is the url for the fallback location.
 
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        # The hook should return a url.
 
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        self['transform_fallback_location'] = []
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# install the default hooks into the Branch class.
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            errors.UnstackableBranchFormat):
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            pass
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        else:
 
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            for hook in Branch.hooks['transform_fallback_location']:
 
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                url = hook(self, url)
 
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                if url is None:
 
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                    hook_name = Branch.hooks.get_hook_name(hook)
 
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                    raise AssertionError(
 
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                        "'transform_fallback_location' hook %s returned "
 
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                        "None, not a URL." % hook_name)
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            self._activate_fallback_location(url)
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    def _check_stackable_repo(self):