Add test for notehead displacements after changing stem direction
Add test for notehead displacements after changing stem direction

Tails/vexflow,Huji/vexflow,Silverwolf90/vexflow,Tails/vexflow,aaronmars/vexflow,Silverwolf90/vexflow,aaronmars/vexflow,Huji/vexflow,Huji/vexflow,Silverwolf90/vexflow,aaronmars/vexflow,Tails/vexflow