Artdaq trace fhicl

   TRACE:{
     TRACE_NUMENTS:500000
     TRACE_ARGSMAX:10
     TRACE_MSGMAX:0
     TRACE_FILE:"/tmp/trace_buffer_%u"  # this is the default (%u replaced by user name)
     TRACE_LIMIT_MS:[8,80,800]  
     TRACE_MODE:0x3                    # global mode - b0 is for memory, b1 controls "slow path"
     TRACE_NAMLVLSET:{
       #name:[lvlsmskM,lvlsmskS[,lvlsmskT]]   lvlsmskT is optional
       name0:[0x1f,0x7]
       name1:[0x2f,0xf]
       name2:[0x3f,0x7,0x1]
     }
   }