ADDBAN <channel> [duration] <mask> <level> <reason>
{ 10} Adds a ban to chanserv
  <channel> : Channel to add ban to
  [duration]: Duration in minutes to keep ban for.
              0/Nonexistent for permanent ban
  <mask>    : nick!user@host mask to ban
  <level>   : Access level to place ban at
  <reason>  : Reason for ban
Only users with the given level of access can remove the ban.

Temporary bans accept the tokens w/d/h to mean weeks, days, 
and hours.  These may not be combined, so "1w" is valid, but
"1w1d" is not.
