* Documentation/user/refman.itely: Run texinfo-all-menus-update

* Documentation/user/refman.itely: Run texinfo-all-menus-update
(fixes make web).

* GNUmakefile.in (web-clean): Do not remove fonts (they do not
live in $(out)-www).

* scripts/lilypond-book.py: Small cleanups.  Junk hairy include
dependencies.  Add link to .ly source in HTML output.
(Lilypond_snippet.output_html): Handle multiple page picture
output.
(Lilypond_snippet.output_html, Lilypond_snippet.output_latex):
Make usable for output_texinfo again.

* Documentation/user/GNUmakefile: Add static dependency for
lilypond.tely includes.