* tests/labeling.cc: New.
	* tests/label.cc: New.
	* mln/fun/to_enc.hh: New.
	* mln/level/to_enc.hh: New.
	* mln/level/labeling.hh: New.
	* mln/value/label.hh: New.
	* img/tiny.pgm: New.

	* tests/README: Fix missing CR.
	* doc/Doxyfile.in: Update.
	* mln/core/trait/is_lowq.hh: Remove.
	* mln/core/trait/all.hh: Update.
	* mln/core/macros.hh: Update.
	* mln/value/set.hh: Update.
	* mln/core/concept/value.hh (++, --): New.
	* mln/level/fill.hh (memset): Force cast.
	* mln/value/lut_vec.hh: Fix warning.
	* mln/value/props.hh (card, mln_card): Rename as...
	(card_, mln_card_): ...these.
	(convert_): New.
	* mln/value/int_s.hh (+=, -=): New.
	* mln/value/int_u.hh: Likewise.
	* mln/value/internal/iterable_set.hh: Use convert_.
	* mln/value/internal/encoding.hh: Factor names.
	* mln/value/internal/value_like.hh (to_enc): New.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@1039 4aad255d-cdde-0310-9447-f3009e2ae8c0