Projectserv: add metadata

[Fuchs]

Adding the following metadata to projectserv as discussed:

• registration timestamp
• person who registered it
• primary flag for contacts
• public flag for contacts

The latter should affect the output in chanserv / nickserv as well, as in: contacts marked as public should be listed if even a user without service privileges does a lookup. Something like

Public group contacts for foo: baa, bar, baz

Primary / Alt group contact on the other hand can be internal information, similar to displaying all group contacts in chanserv as well to privileged users.

[ilbelkyr]

Sorry I didn't get around to this until now, but #11 should address the first half of this (who registered the project, and when).

The public flag for GCs should be easy enough to add as well. I'm wondering how to best handle the primary/alternate distinction for existing contacts, though: we don't want all projectserv-tracked contacts to suddenly be marked as either primary or alternate. Thoughts?