some vtest fixes

wrong pitch of two notes in noteheadposition-1.mscz,
2 accidentals and 3 segnos too much in emmentaler-1.mscz,
wrong trills in emmentaler-8,
wrong position of two articulations in emmentaler-3.png
and two in bravura-5-ref.png

Also adding Windows batch file to generate the -ref.png files