- Permanent bans assigned by global moderators no longer expire immediately
(does not apply retroactively)
- Bans with no reason given no longer have "undefined" as their reason
(applies retroactively)
- 0 is now a selectable value for "ban duration, select 0 for permanent"
new method emptydb
use emptydb instead of flushdb, flushdb removes indices for mongo which
breaks search tests
initialize meta.config properly in tests
enable nodebb-plugin-dbsearch for tests