Version 0.9.9

• Support for mRpt, multiRpt, multiRpt2 and beatRpt MEI elements
• Support for staffGrp labels
• Support for tuplet.vis and numberplacement in tuplet
• Key signature cancellation
• Improved slurs
• Improved ties and support for bulge and curvedir attributes
• Improved justification
• Editorial accidentals
• Improved grace notes (work in progress)
• Staff scale (work in progress)
• Code refactoring for staffDef and attribute classes