Merge pull request #1521 from ronyeh/petzold

Addresses a grace note issue mentioned in the #441 thread.

Author: mscuthbert

tests/bach_tests.ts

@@ -180,7 +180,7 @@ function minuet1(options: TestOptions): void {
 
   /*  Measure 8 */
   system = appendSystem(180);
-  const grace = f.GraceNote({ keys: ['d/3'], clef: 'bass', duration: '8', slash: true });
+  const grace = f.GraceNote({ keys: ['d/3'], clef: 'bass', duration: '4', slash: false });
 
   system.addStave({ voices: [voice(notes('A4/h.[id="m8c"]'))] });
   system.addStave({