[MERGE] add a hook for Branch.set_last_revision_info()

[Aaron Bentley]

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James Henstridge wrote:
>>  For myself, I'd prefer to invoke _make_branch_tip_hook_params after
>>  updating to the new revno and revision_id, since they're only
>>  *predicted* values at this point.

> Well, branch.last_revision_info() needs to be captured prior to
> updating the tip, so something needs to be done before hand.  I guess
> you're suggesting not to trust the method arguments for the new
> revno/revid?
> 
> I guess that makes sense, so I've changed the implementation to use
> last_revision_info() to determine both the old and new revision info.

I like the simplification that brings.

bb:approve

Aaron
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