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

* 'master' of ssh://jomand@git.sv.gnu.org/srv/git/lilypond:
  Toplevel page breaking and page turning commands documentation and
  Use book-(score|text|music)-handlers in book_body elements, after the
  Define music properties used by toplevel page breaking/turning commands.
  quiet PS to PNG conversion
  Revert "Fix so \partial does the setting in Timing instead of Score to support"
  add midi-partial.ly.
  -I input/new/pitch
  add pitch/ directory
  remove README from GNUmakefile.
  strip pitches/ subdir.
  Add a new kind of object, Page_marker, at the same level as scores and
  typo.