- Greatly speedup d-line lookup. Instead of testing every single client against
  every existing d-line just check the just added ban against connected clients.
  Also now check d-line _before_ looking for a matching exempt{}


git-svn-id: svn://svn.ircd-hybrid.org/svnroot/ircd-hybrid/trunk@3929 82007160-df01-0410-b94d-b575c5fd34c7