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

Fix bug where we sometimes didn't fetch all the keys requested for a server.

Change default history visibility for private rooms

Add dev script for finding where functions are called from, and finding functions that aren't called at all

Define __repr__ methods for StreamConfig and PaginationConfig

So that they can be used with "%r" log formats.

Implement configurable stats reporting