Merge branch 'master' into lilypond/translation

* master: (41 commits)
  Update predefined fret diagrams and documentation
  Indexes from Ralph.
  Indexes from Ralph.
  Compile fix
  Patch 0006 from John
  Patch 0005 from John
  Patch 0003 from John
  Patch 0002 from John
  Patch 0001 from John
  Compile fix
  Some additions to NR 1.8 "Text"
  Compile fix in NR 1.8
  Some additions to NR 1.8 "Text"
  Revert fretted-strings.itely
  Saving status that won't build docs
  Update for Expressive and Staff
  GDP NR 5.5.1 Amend layer details
  Fix broken documentation file
  Add predefined fret diagrams to FretBoards context
  GDP LM 4.3.1 Work around for layer
  ...