* core: add custom indexed columns to groups and contacts
* directory: use database (TODO search/listing)
* triggers to maintain current member count
* update simplexmq, fix tests, use summary from GroupInfo
* fix all directory tests
* remove acceptance fields from group reg
* enable all tests
* clean up
* postgres migrations, fixes
* query plans
* use function in postgres triggers, improve sqlite query
* fix export/import
* update schema
* prevent admins from promoting groups when approving
* update listing every 5 minutes