2.15.4 regtests

[Phil Holmes]

Official tracker looks OK - good to see the changes to accidental (no 
natural after sharp->flat and vice versa).

Pixel comparator generally OK - one significant change with glissandi that 
looks wrong to my eyes.  See attached comparison of 15.3 versus 15.4.

--
Phil Holmes
Bug Squad

glissando.png
Description: PNG image