Improve the usability of adding hostmasks to access lists.

* When adding a user by their nickname check for their account
  instead of just adding their hostmask.

* Allow opting out of cleaning up of malformed hostmasks.

data/chanserv.example.conf

@@ -179,6 +179,12 @@ module
 	 */
 	disallow_channel_access = no
 
+	/*
+	 * If set, prevents malformed hostmasks from being added to access lists
+	 * instead of attempting to fix their format.
+	 */
+	#disallow_malformed_hostmask = yes
+
 	/*
 	 * If set, ChanServ will always lower the timestamp of registered channels to their registration date.
 	 * This prevents several race conditions where unauthorized users can join empty registered channels and set