* headers.mk: update dist header list.

	* mln/algebra/vec.hh: add contructor and operator= with literal::zero.

	* mln/canvas/distance_front.hh: avoid a warning.

	* mln/fun/i2v/array.hh,
	* mln/fun/l2l/relabel.hh,
	* mln/convert/from_to.hxx: add new from_to over_loads.

	* mln/convert/impl/all.hh,
	* mln/convert/impl/from_unsigned_to_value.hh: add a new from_to
	implementation to fix ambiguities with from_int_to_value and
	from_float_to_value.

	* mln/win/essential.hh,
	* mln/core/internal/image_identity.hh: update doc.

	* mln/core/routine/essential.hh: fix includes.

	* mln/fun/essential.hh: include fun/meta/essential.hh.

	* mln/util/soft_heap.hh: fix guards.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3507 4aad255d-cdde-0310-9447-f3009e2ae8c0