* Documentation/user/refman.itely: Compile fix for \mark #'(music ...).

* Documentation/user/refman.itely: Compile fix for \mark #'(music ...).

* Documentation/user/internals.itely: Use ly-set-mus-property!.

* cygwin/mknetrel: New file.

* Documentation/windows/fix-suffixes.sh:
* buildscripts/walk.sh: Junk.

* aclocal.m4: Regenerate.

* stepmake/stepmake/topdocs-targets.make:
* stepmake/stepmake/help2man-rules.make:
* stepmake/stepmake/generic-vars.make:
* stepmake/make/stepmake.make:
* Documentation/user/GNUmakefile:
* make/stepmake.make:
* make/lilypond-vars.make:
* GNUmakefile.in:
* stepmake/aclocal.m4: Remove builddir cruftyness.

* stepmake/stepmake/c++-rules.make: Use ALL_CXXFLAGS, to guard
agains user override of CXXFLAGS.

* stepmake/stepmake/c++-vars.make (ALL_CXXFLAGS): Include CXXFLAGS.

* stepmake/stepmake/c-rules.make: Use ALL_CFLAGS, to guard
against user override of CFLAGS.

* stepmake/stepmake/c-vars.make (ALL_CFLAGS): Include CFLAGS.