- Rewrote QPSK frontend tuning functions, after reading the doc - it
    should hopefully fix the infamous "Operation not permitted" problem.
  - Permanently monitor the frontend status, and reinit it if it crashes.
  - New --dvb-high-voltage option for very long cables.
  - Moved all EN 50 221-related code from ts.c to en50221.c. We no longer
    need the --ts-capmt-sysid option because the sysid is determined
    automatically from the CAM.
  - Also changed the way we send the CAPMTs to the CAM, hoping to fix a bug
    with Aston professional CAMs which all of sudden stop descrambling
    a program after a few days.