0.6
  added GOP support
0.5
  Adapted for pd 0.37
0.4
  Added functions bang, values, valuemotion, xvalues, xvaluemotion made by Maurizio Umberto Puxeddu
  Integrated patch from Joseph A. Sarlo for connections 
0.3
  Fixed "goto x y" message 
  ( hall of shame contest : confusion between absolute and relative coordinates )
0.2
  Added "goto x y" message
0.1
  first implementation