* mln/accu/compute.hh,
	* mln/accu/transform.hh,
	* mln/accu/transform_diagonal.hh,
	* mln/accu/transform_directional.hh,
	* mln/accu/transform_line.hh,
	* mln/accu/transform_snake.hh,
	* mln/accu/transform_stop.hh,
	* mln/core/concept/meta_accumulator.hh,
	* mln/data/compute.hh,
	* mln/labeling/compute.hh,
	* mln/set/compute.hh,
	* mln/set/compute_with_weights.hh: use a helper to deduce the
	accumulator type from a meta accumulator.

	* mln/core/image/dmorph/extended.hh: define 'value'.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@4246 4aad255d-cdde-0310-9447-f3009e2ae8c0