Merge branch 'master' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond

Merge branch 'master' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond

* 'master' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond:
  Fix build (use proper line feed)
  MusicXML: Produce only one output file; optionally use stdin/stdout
  Fix build (files used wrong CRLF vs. CR vs. LF, so lilypond barfed and exited)
  More @ref{}.
  Rename @refs{}.
  Update from Valentin.
  Update \parenthesis instructions.
  Added @seealso IR refs in NR1.7 Editorial
  Added @seealso IR refs in NR1.1 Pitches
  MusicXML: Convert <eyeglasses> to lilypond