Adds an option to set the alignment's insertion and deletion penalties, and drops the built-in MusicXML parser.
Full notes:
- Adds a -p DOUBLE option to tune the alignment and defaults to 1.0 (previously was 0.6).
- Removes the included MusicXML parser and adds a recommendation to use Musescore3 instead.
- Makes the alignment search process much faster, and prints progress.
- Bugfix for MIDI files with time signatures with small denominators returning no tatums.