Rewrote Multi::Maintenance
Rewrote Multi::Maintenance

Everything now uses Async SQL access, and doesn't rely on
POE::Component::Cron anymore.

I removed a few maintenance functions that weren't needed. Warning for
unkanime is already done by Multi::Anime, and integrity checking should
really be done in PgSQL.

The tag<->vn cache is now also regenerated daily rather than hourly.

christian-roggia/vndb,morkt/vndb,erengy/vndb,morkt/vndb,morkt/vndb,morkt/vndb,christian-roggia/vndb,erengy/vndb,christian-roggia/vndb,morkt/vndb,erengy/vndb