Fixes between -rc4 and -rc5:
- Windows: Crash on connect reported by 1 user
- Added workaround for rare "Cannot accept connections" flood
- OperOverride did not work (INVITE+JOIN)
- LIST never ended if more than 64 channels to list
- JOIN error message not shown if IRCOp
- SAJOIN ignored set::level-on-join
See also What's new in UnrealIRCd 4.