- Instead of silently truncating WHO at 500 replies, added ERR_WHOLIMEXCEED numeric
  to inform users about the /who limit being exceeded


git-svn-id: svn://svn.ircd-hybrid.org/svnroot/ircd-hybrid/branches/8.2.x@4509 82007160-df01-0410-b94d-b575c5fd34c7