Provide ability to login using CAS

Add a flag to initial sync to include we want rooms that the user has left

Allow synapse's useragent to be customized

Remove log line that was generated whenever an error was created.

Remove log line that was generated whenever an error was created. We are now creating error objects that aren't raised so it's probably a bit too confusing to keep

This will allow me to write tests which verify which server made HTTP
requests in a federation context.

Bundle in some room state in invites.

Add flag which disables federation of the room

Atomically persist events when joining a room over federation/

Validate the receipt type before passing it on to the receipt handler

Set m.room.canonical_alias on room creation.

Remove some of the unused definitions from synapse

Allow config file path to be configurable in in synctl

Also, allow it to be run from directories other than the synapse directory

Fix order of ON constraints in _get_rooms_for_user_where_membership