* milena/headers.mk: add new headers to distribution.

	* milena/mln/core/image/graph_elt_neighborhood.hh,
	* milena/mln/core/image/line_graph_elt_neighborhood.hh: new files. Add
	new aliases for graph based neighborhoods.

	* milena/mln/core/image/graph_elt_window.hh,
	* milena/mln/core/image/line_graph_elt_window.hh,
	* milena/mln/core/internal/neighborhood_base.hh,
	* milena/tests/core/image/graph_image.cc,
	* milena/tests/core/image/line_graph_image.cc,
	* milena/tests/core/other/graph_elt_neighborhood.cc,
	* milena/tests/core/other/line_graph_elt_neighborhood.cc,
	* milena/tools/area_flooding.cc: make use of these new aliases.

	* milena/tests/unit_test/Makefile.am,
	* milena/tests/unit_test/mln_core_image_graph_elt_neighborhood.cc,
	* milena/tests/unit_test/mln_core_image_line_graph_elt_neighborhood.cc:
	Add new unit tests.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3130 4aad255d-cdde-0310-9447-f3009e2ae8c0