Some refactoring, more comments
Tree view for MIDI import operations
Refactoring of quantization
Meter-adapted duration subdivision
Row for all tracks selection in GUI panel
Adapt tst_importmidi to new duration subdivision
Proper rests handling in compound meter
Replaced typedefs with actual types
fix crash when entering note entry on a drum staff
Merge pull request #373 from trig-ger/midi_meter

Meter-adapted duration subdivision