convert vdr packages to new package format. bump vdr to 2.1.1 and drop rotorng.

rotorng functionality is now supported by vdr-core.

See vdr HISTORY:
  + Supports GotoN (aka "DiSEqC 1.2") and GotoX (aka "USALS").
  + The new DiSEqC command code 'P' can be used to instruct a positioner to move the
    dish to the required satellite position