TCEC draw rule: fix off-by-one error which caused a draw to be adjudicated at 39... instead of at 40.
Plies for draw rule and display were being improperly rounded up.
Change 'Elo' to 'Rtng' since we don't know what kind of rating is being used.
Add dot (instead of space) in crosstable, where engine would be playing itself.
Replace use of QTime with QElapsedTimer to avoid problems with clock/daylight savings-related time changes and elapsed time calculation.