Added initial ping checker, cleaner handling of disconnects (remove stale users and empty channels), and a fix to allow leading whitespace in PRIVMSGs and NOTICEs (thanks to nateM for this and the ircII fix from yesterday)


git-svn-id: svn://svn.devux.org/rubircd/trunk@51 ee5ec8d9-9059-491c-9dba-d8e79e715dbe