[MERGE] Add 'repository' hook for the info command

[Jelmer Vernooij]

This patch makes it possible to register hooks that can add extra
contents to the "Repository:" section printed by "bzr info -v". This is
useful to e.g. be able to print the svn repository UUID as part of "bzr
info -v", something that bzr-svn users have asked me about.

Cheers,

Jelmer
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