* Documentation/user/macros.itexi: Use @ref instead of @inforef

* Documentation/user/macros.itexi: Use @ref instead of @inforef
for html.  Apparently, ``you should'' in texinfo documentation is
merely a guideline that can safely be ignored.

* elisp/lilypond-init.el (auto-mode-alist): Add .ily to
auto-mode-alist.

* input/test/engraver-example.ily:
* input/regression/allfontstyle.ily: Rename, update users.