[MERGE/RFC] Add transport jail to bzr smart server; add ignore_fallbacks option to BzrDir.open_branch

[Andrew Bennetts]

Martin Pool wrote:
[...]
> >
> > This still holds!  People who aren't Robert: share your thoughts!
> 
> I'd be inclined to start with less magic and then add magic if needed.
[...]
> 
> Hope that helps.

It does, thanks.  The patch has now landed without magic (but Robert's other
tweaks done).  I'm sure Robert and I will both be keeping a close eye on how
it works out in future server-side bzrlib code and in plugins.

-Andrew.