* tests/sparse_image.cc,
	* tests/run_pset.cc,
	* tests/rle_image.cc: test.
	* mln/core/sparse_encode.hh: Encode an image into a sparse image.
	* mln/core/internal/run_image.hh: New, factorisation class.
	* mln/core/internal/run_psite.hh: New, run psite class.
	* mln/core/internal/run_pset.hh: New, point set of run image.
	* mln/core/rle_image.hh: New, rle_image class.
	* mln/core/rle_encode.hh: Encode an image into an rle image.
	* mln/core/sparse_image.hh: New, sparse_image class.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@1046 4aad255d-cdde-0310-9447-f3009e2ae8c0