Implement a correction for FADC trigger time slippage

  Correction is done in the hitlist by comparing the trigger time
  from the TI to the trigger time in the FADC.  These generally have
  a fixed offset.  A FUDGE offset is included to make the difference
  between the FADC and TI times zero or close to zero.

  The FADC delivers times in units of 0.0625 ns.  The trigger time is in
  units of 4ns.  So the FADCs will be shifted by 64 units for each unit
  of trigger time slippage.