Avoid shorthand table names.

Thanks to f'ing LOCK TABLES, they can cause problems.
Allow retraction of unconfirmed review requests.

And retract review requests by reviewer email, not review ID.
Paper data loaded from the DB is loaded as a PaperInfo object.

The PaperInfo object can load information about the relationship
between a contact and the paper. This is, I hope, more robust than
the previous method of having an implicit relationship between
"myReviewType" (e.g.) and a particular contact.

Signed-off-by: Eddie Kohler <ekohler@gmail.com>
Remove deprecated helpers.