[MERGE] Add BzrDirFormat.register_control_format_lazy()

[Jelmer Vernooij]

This patch adds a way to register non-bzr control formats lazily. This
makes it possible for e.g. bzr-svn to not load half of subversion unless
bzr-svn is actually used.

Cheers,

Jelmer
-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at jabber.fsfe.org
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