[MERGE] add stop_rule to Branch.iter_merge_sorted_revisions()

[Ian Clatworthy]

I wrote on 25/01/2009:
> It looks like 'inclusive' isn't flexible enough. I'm going to add a
> parameter called (something like) stop_rule with values of:
> 
> * "exclude" - leave the stop revision out of the result
> * "include" - put the stop revision in the result
> * "with-merges" - put the stop revision and nested merges in the result.

Attached.

> Any thoughts on the best default? It's currently "include" but
> the API has only existed for 24 hours so I'll change it to
> "exclude" (say) if we think that's the most common case.

I've made exclude the default. I don't think it matters much and
I'm happy to choose a different one if anyone feels strongly.

Ian C.
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