* mln/tag/init.hh (tag::data_t): New tag type.
	 (tag::data): New tag.
	* mln/core/image/imorph/decorated_image.hh
	(init_(tag::data_t, D&, const decorated_image<I,D>&))
	(init_(tag::data_t, D&, const decorated_image<I,D2>&))
	(init_(tag::image_t, decorated_image<I,D>&, const J&)):
	New functions.