[PATCH 2 of 2] bundle2: add support for changegroup2

[Mike Hommey]

On Tue, Sep 02, 2014 at 12:46:50PM +0200, sune.foldager at me.com wrote:
> I accidentally included a commented-out print-statement in the delta
> parent function below.
> 
> Pierre-Yves wanted bundle2 to be able to include both cg1 and cg2, but
> I don’t see why we need that; this change will break existing bundle2
> anyway, so people who use it will need to update both ends in all
> cases. Pierre-Yves, what do you think?

FWIW, one usecase of my most recent patch was to allow for a mercurial
server to provide a bundle2 with one part being a link to an existing
bundle10 we refresh every day at Mozilla, and have the client understand
that. That requires bundle2 to be able to include both cg1 and cg2.

Mike