Merge branch 'master' into lilypond/translation

Merge branch 'master' into lilypond/translation

* master:
  bump version
  Fix German docs compilation
  Update German docs
  MusicXML: wrap lyrics in quotes.
  MusicXML: replace soft-hyphens in the lyrics with soft dash
  Implement the conversion of lyrics from MusicXML to lilypond.
  MusicXML: don't use the class_dict directly
  musicxml: if no work-number or opus is found, return an empty string.
  MusicXML: convert score information into the \header{..} construct in lilypond.
  MusicXML: coding style fixes.
  Reorganize main doc page; remove biblio and regtests.
  Fix list of platforms for binaries.
  oops, wrong fix
  another typo
  typo
  Fix confusing order of polypony/chords.
  add regtest for x-staff beam with script case.

Conflicts:

	Documentation/de/user/introduction.itely
	Documentation/de/user/tutorial.itely
	Documentation/po/de.po