* doc/examples/mk_graph.cc: use int_u16 instead of int_u8.

	* mln/debug/colorize.hh,
	* mln/debug/draw_graph.hh,
	* mln/level/compute.hh,
	* mln/literal/zero.hh,
	* mln/value/concept/symbolic.hh,
	* mln/value/int_u.hh,
	* mln/value/internal/value_like.hh: Cleanup comments.

	* tests/core/image/graph_image.cc: Fix includes.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@2934 4aad255d-cdde-0310-9447-f3009e2ae8c0