Bug #1079 - Don't use users real host and IPs when matching against

bans and excepts, except when a user is unbanning themselves, in an
attempt to prevent people from gaining other users IPs.
This removes support for Unreal and Bahamuts SVSMode -b because
it will unban users by real host and IP.

modules/protocol/plexus.cpp

@@ -25,7 +25,6 @@ IRCDVar myIrcd[] = {
 	 0,				/* Join 2 Message */
 	 1,				/* Chan SQlines */
 	 0,				/* Quit on Kill */
-	 0,				/* SVSMODE unban */
 	 0,				/* vidents */
 	 1,				/* svshold */
 	 1,				/* time stamp on mode */