- added ly.rests containing various rest manipulations
- robust Python 3 support, Python 3 is now recommended, although 2.7 will
still be supported for the foreseeable future.
- don't yield the duration in a \tuplet command as a music token (issue
wbsoft/frescobaldi631)
- a script `xml-export.ily` has been included to dump the music structure
inside LilyPond to an XML file. This is not used yet, but could be used in the
future to use LilyPond to parse files and build music, and then export it
to other formats.
- MusicXML export improvements