Update of Schubert's "Gretchen am Spinnrade"

Removed unused file defs.ly (no need to update it in future)
Update of Schubert's "Die Forelle"

- Slim defs.ly a bit.
- Add cross-staff arpeggios (there was some indication in the source
  that there should be such arpeggios)
Update of Schubert's "Einsamkeit"
Update of Kuhlau Sonatine Allegro
Update of Kuhlau Sonatine Andante
Update of Kuhlau Sonatine Rondo
Update of Mendelsohn-Bartholdy O36
Update of Medelsohn-Bartholdy O70
Update of Mozart KV574
Update of Rameau "Les Sauvages"

Close #110
Merge branch 'SchubertF' of https://github.com/doughdemon/The-Mutopia-Project
Header tweaks
Merge branch 'badutf8-block4' of https://github.com/doughdemon/The-Mutopia-Project
Header tweaks
Header tweaks
Header tweaks
Header tweaks
Header tweaks