THcTimeSyncEvtHandler can correct runs where the 1190's in a crate
  go out of sync because of a large event.  (This would happen in the
  spring of 2018.  Should be fixed in the DAQ now.)  It a previous version
  this sync problem was detected by looking for 1190 banks that were too large.
  In this update, the first event is used to make a list of which slots
  have TDCs in them.  For subsequent events, it checks that every TDC slot
  has a header and trailer word in the bank.  If any TDCs are found to be
  missing, and the bank size is above a threshold, subsequent events are
  presumed to be out of sync and corrected for in the filtered run output file.