New "limit" config variable, and some module fixes.

modules/info.py

@@ -49,6 +49,7 @@ def stats(phenny, input):
    ignore = set(['f_note', 'startup', 'message', 'noteuri'])
    for (name, user), count in phenny.stats.iteritems(): 
       if name in ignore: continue
+      if not user: continue
 
       if not user.startswith('#'): 
          try: users[user] += count