Merge branch 'master' into lilypond/translation

Merge branch 'master' into lilypond/translation

* master: (21 commits)
  Update for expressive.itely
  update from Kurt.
  Update from Carl.
  Ignore lsr-unsafe.txt.
  LSR: Update.
  Remove @bullet in NR 1.8
  Second half of Kurt's update.
  First half of Kurt's update.
  Update from Valentin.
  Update from Valentin.
  Update from Carl.
  Correct documentation following fix to Issue 552
  MusicXML: Fix major-minor, add power chord as noted by Carl Sorensen
  Bump version.
  Typo
  New markup command snippets.
  Update from Valentin.
  Preventing LilyPond to delete PDF files on *nix systems
  GDP: Move Useful concepts and properties to Changing defaults
  Fix #313 (2).
  ...