Merged revisions in log

[Gustavo Niemeyer]

> Thanks Gustavo, I've merged this, with a variation ...
> get_merged_revisions was non incremental, which meant there was a large
> delay before any output occured in big branches, magnified hugely for
> remote branches.
> 
> So, I used branch.get_ancestry to generate the merged revisions for a
> single revision on the fly, which means there is no big up front delay
> while everything is scanned, and log of remote branches works (although
> latency per revision still sucks ;)).

Nice change. Thanks!

-- 
Gustavo Niemeyer
http://niemeyer.net