* src/ntl-app.c (display_prototype_caveat): Changed to simply use
	a gnome_warning_dialog instead of a nautilus_simple_dialog. We
	loose the word wrapping though. But now the main window loads
	while the warning is present, plus it's a real GNOME warning box,
	so be afraid...
	(display_prototype_caveat): If NAUTILUS_NO_CAVEAT_DIALOG is set,
	do not display the caveat warning.