Branch "experimental" for testing new features!

	new file:   TODO (a few TODO's, info about bugs can be found at http://raypump.com/help/faq?start=2)
	modified:   raypump_ui_panel.py
		*changed bl_info blender version to (2, 6, 6) to allow testing under 2.66
		*enhanced handling of Unicode names (shows an error message instead of crashing or using an invalid path)
		*enhanced support for external files (they get packed in an external blender and the original is kept untouched)