Remove unneeded imports that don't work in python3, avoid an infinite
recursion in __contains__, remove unneeded method using a deprecated
function, fix variable error

Index: ircbot.py
--- ircbot.py.orig
+++ ircbot.py
@@ -25,10 +25,9 @@ write simpler bots.
 """
 
 import sys
-from UserDict import UserDict
 
 from irclib import SimpleIRCClient
-from irclib import nm_to_n, irc_lower, all_events
+from irclib import nm_to_n, irc_lower
 from irclib import parse_channel_modes, is_channel
 from irclib import ServerConnectionError
 
@@ -263,11 +262,6 @@ class IRCDict:
             self.update(dict)
     def __repr__(self):
         return repr(self.data)
-    def __cmp__(self, dict):
-        if isinstance(dict, IRCDict):
-            return cmp(self.data, dict.data)
-        else:
-            return cmp(self.data, dict)
     def __len__(self):
         return len(self.data)
     def __getitem__(self, key):
@@ -284,7 +278,8 @@ class IRCDict:
     def __iter__(self):
         return iter(self.data)
     def __contains__(self, key):
-        return key in self
+        return True if key in self.keys() else False
+
     def clear(self):
         self.data.clear()
         self.canon_keys.clear()
@@ -424,7 +419,7 @@ class Channel:
 
     def limit(self):
         if self.has_limit():
-            return self.modes[l]
+            return self.modes["l"]
         else:
             return None