Added some code to make finishing the OpenID login work.
Changed the OID storage so that there's a "canonical" URL and a
display URL. This is because of i-names, which is annoying.
If the login succeeds, we try to find a local user associated with the
canonical URL. If they don't exist, we let the user either create a
new account, or login to an existing account and connect to it.
A totally unrelated change is that the DB engine now uses InnoDB.
darcs-hash:20080618052638-84dde-909e51dbd5b9eadadf18cd010868baa18ea2349a.gz
