Improve UserManager::QuitUser() and related code•••- Make operreason optional; NULL means same as quitreason
- Remove User::quietquit, it is now handled internally in spanningtree
- Send snotice about quitting remote users from spanningtree
Change modules to use the MODNAME constant when logging.•••The majority of modules were logging with their module name as the
log type. There was a few places which were logging to a non-name
type but, with the exception of CONFIG, those messages are so
uncommon that it doesn't make sense to use a seperate type for
them.