* .cvsignore: Remove stepmake (huh!?!), add lib.

* .cvsignore: Remove stepmake (huh!?!), add lib.

* GNUmakefile.in: Add libdir links for builddir runs.

* scripts/midi2ly.py: Add [lilypond_]libdir/python to path,
instead of datadir.

* make/substitute.make (ATVARIABLES): Add lilypond_libdir,
local_lilypond_libdir.

* config.make.in (lilypond_libdir): Add.

* stepmake/stepmake/substitute-rules.make:
* stepmake/stepmake/script-rules.make:
* stepmake/stepmake/python-module-rules.make:
* stepmake/aclocal.m4 (STEPMAKE_LIBDIR): Fixes from
lilypond-python-module patch.