anchor.diff:  %%%         {ip,Port,Queue}
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   pack(Cnf) ->
  -  {Flags,RTPs} = lists:foldl(fun chk_trc/2,{[],[]},slist(Cnf#cnf.trc)),
  +  Flags0 = [call,timestamp],
  +  {Flags,RTPs} = lists:foldl(fun chk_trc/2,{Flags0,[]},slist(Cnf#cnf.trc)),
     dict:from_list([{time,chk_time(Cnf#cnf.time)},
  -                  {flags,[call,timestamp|maybe_arity(Cnf,Flags)]},
  +                  {flags,maybe_arity(Cnf,maybe_trace_child(Cnf,Flags))},
                     {rtps,RTPs},
                     {procs,[chk_proc(P) || P <- mk_list(Cnf#cnf.procs)]},
                     {where,where(Cnf)}]).
  
positive.code: 
  maybe_arity(#cnf{arity=true},Flags) -> [arity|Flags];
  maybe_arity(_,Flags)                -> Flags.
  
  chk_time(Time) when is_integer(Time) -> Time;
  chk_time(X) -> throw({bad_time,X}).
  
negative.code:      , "cookie       (host cookie) target node cookie"
       , "blocking     (false)       block start/2, return a list of messages"
       , "arity        (false)       print arity instead of arg list"
       , "trace_child  (false)       children gets traced (set_on_spawn)"
       , "buffered     (false)       buffer messages till end of trace"
       , "discard      (false)       discard messages (when counting)"
       , "max_queue    (5000)        fail if internal queue gets this long"
  