* po/nl.po: Some updates.

	* po/nl.po: Some updates.

	* scm/lily.scm (_): New function.
	(postscript->pdf, postscript->png, lilypond-main)
	(postscript->pdf): Use it.  Write messages to stderr.

	* stepmake/stepmake/po-targets.make (ALL_PO_SOURCES): Add SCM_FILES.

	* scm/GNUmakefile (XGETTEXT_FLAGS): Set language to Lisp.
	xgettext does not recognise scheme yet.  Patch submitted.

	* lily/scm-option.cc (LY_DEFINE):
	* lily/main.cc: The program is now called lilypond (WAS: lilypond-bin).

	* lily/rest-collision.cc (do_shift): Uniformise two too many rests
	messages.

	* lily/include/paper-book.hh
	* lily/include/paper-system.hh: Finish renaming of paper-line to
	system.  Fix users.