- Advanced code migrations now disable then re-enable triggers.
Brings run time down to < 15 seconds, no need to thread them.
- Changing ap_ids and actor_ids in migrations to a fake url,
so it doesn't break XsdAnyUri in activitystreams.
- Creating an activity table.
- Adding some federation-related columns to the user_ and community
tables.
- Generating the actor_id and keys in code, updating the tables.
