* mln/core/site_set/p_graph_piter.hh,
	* mln/core/internal/image_base.hh,
	* mln/core/image/essential.hh: update doc.

	* mln/core/image/all.hh: include new headers.

	* mln/core/image/vertex_image.hh
	* mln/core/image/edge_image.hh: new image types.

	* mln/core/image/graph_elt_neighborhood.hh,
	* mln/core/image/graph_elt_window.hh: update according new image
	types.

	* mln/core/image/line_graph_elt_neighborhood.hh,
	* mln/core/image/line_graph_elt_window.hh: not needed anymore.
	Removed.

	* mln/core/internal/neighb_niter_impl.hh: update template parameter
	names.

	* mln/core/routine/init.hxx: add new init routines for new image
	types.

	* mln/core/site_set/p_edges.hh,
	* mln/core/site_set/p_vertices.hh: use Graph concept in constructor
	instead of exact type.

	* mln/debug/draw_graph.hh: add missing traces.

	* mln/morpho/attribute/count_adjacent_vertices.hh: make it more
	generic.

	* mln/morpho/closing/area_on_vertices.hh,
	* mln/morpho/line_gradient.hh: use the new types.

	* mln/pw/image.hh: revamp and move most of the code...
	* mln/pw/internal/image_base.hh: ... here.

	* mln/tag/skeleton.hh: add tag::graph.

	* mln/trait/ch_value.hh: add traits for new image types.

	* mln/util/graph.hh: Add a method returning the edge vector.

	* tests/core/image/Makefile.am,
	* tests/core/image/vertex_image.cc,
	* tests/core/image/edge_image.cc: new tests.

	* tests/core/image/graph_image.cc,
	* tests/core/image/line_graph_image.cc,
	* tests/core/site_set/p_edges.cc,
	* tests/morpho/artificial_line_graph_image_wst.cc,
	* tests/morpho/graph_image_morpho.cc,
	* tests/morpho/graph_image_wst.cc,
	* tests/morpho/lena_line_graph_image_wst1.cc,
	* tests/morpho/lena_line_graph_image_wst2.cc,
	* tests/morpho/line_graph_image_morpho.cc,
	* tests/morpho/line_graph_image_wst.cc,
	* tests/util/graph.cc: update graph related tests. Use the new image
	types.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3655 4aad255d-cdde-0310-9447-f3009e2ae8c0