Update to 2.17.12:
We are happy to announce the release of LilyPond 2.17.12. This
release contains the usual number of bugfixes and enhancements,
and contains some work in progress. You will have access to the
very latest features, but some may be incomplete, and you may
encounter bugs and crashes. If you require a stable version of
Lilypond, we recommend using the 2.16 version.