[MERGE] dpush / foreign vcs testing

[Stefan Monnier]

> I would expect this to be an option for ‘push’. Suggestions:
>     ‘push --foreign-clean’
> or
>     ‘push --foreign-only’

I'm not sure if I understand correctly what it does, but isn't it the
case that it takes the state at the tip of the branch and commits it to
some other branch (in the case og bzr-svn, it's a foreign branch),
losing all the metadata along the way?

If so, it's as much a "push" as a "commit".


        Stefan