0.10
  fixed coordinates for GOP support
0.9
  added GOP support
0.8
  adapted for pd 0.37
0.7
  fixed more crashes in carmona
0.6
  fixed a crash when resizing
0.5
  introduced turntable inertia
  allow playing when the scratcher is stopped
0.4.1
  little optimisation in movement processing
0.4
  change algorithm, new one requires a small block size
  added maximum speed limit
  added ability to toggle speed line
  suppressed internal velocity measurement
  ( because time measurement is not reliable )
0.3
  introduced internal velocity measurement
0.2
  added sensibility setting
0.1
  first implementation