b - show all tcm bot link attempts, invalid connections attempts
      etc
  c - see all clone connections
  C - see all client connections
  d - debugging usermode - combination of all other usermodes
      plus debug() calls
  e - see all clone exits
      (Note: exits are only shown if STATSERVICES is defined,
       since HashDelClient() only finds clone matches to
       update StatServ unique client counts)
  E - see all client exits
  j - see channel joins
  k - see channel kicks
  l - show whenever a server links/delinks to/from the network
  m - see channel mode changes
  n - see nickname changes
  o - see new operators
  O - see operator kills
  p - see channel parts
  s - show commands executed through service nicks
  S - see server kills
  t - see channel topic changes
  y - show various events such as ignore expiration, database
      saves, gline expiration, hub server connections etc.