0.5
  fixed help patches for pd 0.37
0.4
  fixed pdp-0.12 compatibility on my own this time
0.3
  fixed pdp-0.11 compatibility with advice from Thomas Wurzer
0.2
  added pdp2gem based on a skeleton of pix_film
  spare a refresh in gem2pdp (faster)
0.1
  first implementation : includes gem2pdp
