2.15.13 and 2.13.14 regtests

[Phil Holmes]

I checked the regtests for 2.15.13 both on the official page and my pixel 
comparator.  Nothing stood out as wrong.

I've looked over the official page for 2.15.14.  There are a lot of -warning 
notes in the logfile comparisons - I'm presuming this is an intended upshot 
of 1477.  There are also changes to tremolos (Issue 1929) and other apparent 
changes where nothing is shown graphically and I can't eyeball a difference.

All in all - all look OK.

--
Phil Holmes