[PATCH 1 of 2 RFC] subrepo: create subrepo cache and create working dir subrepos as shared repos

[Matt Mackall]

On Fri, 2013-11-15 at 21:15 +0100, Angel Ezquerra wrote:
> - This change is backwards compatible.

What if an old client tries to work with a repository checked out by a
newer hg?

What if a new client tries to work with a repository checked out by an
older hg?

I don't see any form of fallback handling, so I'm not sure how either of
these could work.

-- 
Mathematics is the supreme nostalgia of our time.