Fixes to auth detection and message parsing

* don't check authentication if the network doesn't need to
  register
* don't pass through muser for ZNC type messages
* avoid duplicate message for queries containing highlights
* make a copy of the cast for metadata analysis to avoid poisoning it
* set up callback for when the instance is authenticated, so we can
  request a LIST immediately if so desired
* separate out seeding functions to populate CHANLIMIT to ease future
  work involving other options, such as PREFIX

modules/chankeep.py

@@ -12,7 +12,7 @@ def allRelaysActive(net):
     for i in main.network[net].relays.keys():
         name = net+str(i)
         if name in main.IRCPool.keys():
-            if main.IRCPool[name].authenticated and main.network[net].relays[i]["registered"]:
+            if main.IRCPool[name].authenticated:
                 existNum += 1
     if existNum == relayNum:
         return True