- applied latest changes by Juergen Peitz (great work!)
  o as a workaround for the lockup problem the data valid signal is
    checked after every channel switch.  If it is not set FEC parameters
    are set again.
  o disabled autoprobing if FEC settings are known (from sp887x). 
  o added support for FE_READ_UNCORRECTED_BLOCKS (from sp887x).
  o added support for FE_SLEEP (from sp887x).
  o bit error rate is now not only read from register 0xC07 but also
    from 0xC08 (from sp887x). 
  o I2C feedthrough to the tuner is now only enabled when needed (from
    sp887x).
  o Added FE_CAN_QAM_AUTO and FE_CAN_HIERARCHY_AUTO to
    dvb_frontend_info.
  o Removed obsolete setting of default frontend parameters in
    sp8870_init.
  o Removed obsolete module parameter 'loadcode' because changes in the
    saa7146 driver made firmware loading very fast.