[MERGE] Allow hooks to add new entries to version-info.

[Jelmer Vernooij]

Robert Collins wrote:
> Robert Collins has voted resubmit.
> Status is now: Resubmit
> Comment:
> You need to register your hooks with the registry in bzrlib.hooks.
Thanks for the review, I've attached an updated patch.

I hadn't seen the hooks registry before; does this also allow lazily
installing hooks by not loading the *Hooks instances or is it just for
the hooks help?

Cheers,

Jelmer
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