bzr-dir phase 2 and checkouts merged [to integration].

[Robert Collins]

At the user visible end this adds network 'bzr upgrade' support and 'bzr
checkout' and 'bzr update' support.


For plugin writers, those authors with plugins that do branch cloning
and pushing will need to update their plugins - not to keep working
(that should be a no-brainer api wise), but to individually identify and
push the separate components - pushing in a checkout should push the
branch; pushing with a repository should push the repository before the
branch and lock it.


========= IMPORTANT ============

The 'metadir' format that supports the new bzr checkout and update
commands is not finalised: we are waiting on the new lock logic from
Martin to be merged. At the moment you can use it, but be ready to
manually adjust it as new code lands in bzr.dev.

Once bzrdir phase 3 lands it will be much easier to manage multiple
formats (the phase 2 code base makes it easier to manage the code, not
to implement 'upgrade' - thats in phase 3).

===================================


Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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