* oln/core/lookup_table.hh (oln::lookup_table::reverse_iterator)
	(oln::lookup_table::const_reverse_iterator): New typedefs.
	(oln::lookup_table::rbegin, oln::lookup_table::rend): New methods.
	* oln/core/typedefs.hh (bkd_viter_type): New virtual type
	declaration.
	* oln/core/gen/bkd_viter_lut.hh: New.
	* oln/core/gen/fwd_viter_lut.hh: Typos.
	* oln/morpher/with_lut.hh
	(single_vtype<morpher::with_lut<Image,Lut>, typedef_::bkd_viter_type>):
	New.
	* tests/morphers/with_lut.cc (main): Test backward value iterator
	on look-up table.
	* oln/Makefile.am (nobase_oln_HEADERS): Add
	core/gen/bkd_viter_lut.hh.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@705 4aad255d-cdde-0310-9447-f3009e2ae8c0