* demo/viewer/Makefile.am,
	* demo/viewer/demodir.hh.in: Update demodir replacement.

	* demo/viewer/browser_widget.cc,
	* demo/viewer/browser_widget.hh: Add a new method.

	* demo/viewer/runner.cc,
	* demo/viewer/runner.hh,
	* demo/viewer/step_widget.cc,
	* demo/viewer/step_widget.hh,
	* demo/viewer/viewer.cc,
	* demo/viewer/viewer.hh: Introduce "export as" functionality.