'Can redefine default value' for all MIDI import options
Fix too small note length after beat adjustment
Don't check by default halved beat count for human performances
Max voice count = 2 for human performances by default
Update clef handling in MIDI import
Remove too small overlapping notes
Fix tuplet deletion during voice separation
Inline some functions in ReducedFraction class
Potential fix of preserving staccato for off times
Fix non-tuplet note inside tuplet after remove overlaps