* Use SourceCompat everywhere (better compat with other software)
* Name field should not be mandatory in Group
* also check page.cc field for community id
* add gnu social tests
* better to use option<sourcecompat>
* update gnu social tests, marked vote as "unlisted"
* Implement instance actor
* wip: make site bans federate
* finish implementation and unit tests for federated bans
* start adding api tests
* fix api test
* remve site from GetCommunityResponse
* only federate site bans originating from user's home instance
* dont expose site.private_key in api