1 - message queueing/dequeuing
    2 - remote file/dir open/close
    4 - DESTROY calls
    8 - hexdumps of incomming packets
   16 - hexdumps of outgoing packets
   32 - _do_io, _conn_lost
   64 - _set_error, _set_status
  128 - on the fly transformations
  256 - add timestamp and process id 
  512 -
 1024 - hexdump of sysreads
 2048 - hexdump of syswrites
 4096 - _rel2abs
 8192 - mkpath
16384 - put method
32768 - recursive methods