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

[James Henstridge]

On 09/04/2008, John Arbash Meinel <john at arbash-meinel.com> wrote:
>  BB:resubmit
>
>  I agree that I prefer Ian's hook and James's tests. So if we can get the
> two
>  merged I think we would have a great hook.

Note that since the start of this thread I've merged my code with
Ian's.  So I take it that this resubmit request is for the already
superseded code?

The current version uses Ian's API, providing both the new and old
revision numbers and IDs to the hook through a params object.

James.