Merge branch 'master' into lilypond/translation

* master:
  Remove unnecessary quotes from \repeat commands in the examples.
  Minor updates to converting.
  More doc reorg.
  Third phase of reorg: half of lilypond-book.
  Second phase of program usage reorg: running.
  Clarify main doc page (manual now covers only the .ly file format, not
  First phase of program usage reorg: install and setup.
  Robustness fixes: generate entire string, then write.
  indent nit
  formatting nit.
  Add another trill spanner reg test.
  nitpick: sort properties alphabetically
  Fix #420
  Clarify input/  directories.
  Remove troublesome LSR snippet.