images.

	* tests/morphers/with_lut.cc (main): More static checking of
	the interface of an image with LUT.
	Test oln::level::fill on an image with LUT.
	* oln/level/fill.hh
	(level::fill(abstract::
	 mutable_image_being_value_wise_random_accessible<I>&))
	(level::impl::
	 fill(abstract::mutable_image_being_value_wise_random_accessible<I>&)):
	 New.
	* oln/core/typedefs.hh (oln_fwd_viter, oln_fwd_viter_)
	(oln_bkd_viter, oln_bkd_viter_, oln_viter, oln_viter_): New macros.
	* oln/core/gen/bkd_viter_lut.hh
	(bkd_viter_lut::bkd_viter_lut(const morpher::with_lut<Image, Lut>&))
	* oln/core/gen/fwd_viter_lut.hh
	(fwd_viter_lut::fwd_viter_lut(const morpher::with_lut<Image, Lut>&))
	New ctors.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@709 4aad255d-cdde-0310-9447-f3009e2ae8c0