* mln/value/cast.hh: Rename as...
	* mln/core/cast_image.hh: ...this.
	Update.
	* mln/core/concept/value.hh (cast): Move to and rename as...
	* mln/value/cast.hh (cast_image): ...this, here.
	* tests/cast_image.cc: Update.

	* mln/morpho/thickening.hh: New.
	* mln/morpho/laplacian.hh: New.
	* mln/morpho/thick_miss.hh: New.
	* mln/morpho/thin_fit.hh: New.
	* mln/morpho/thinning.hh: New.
	* tests/morpho_thinning.cc: New.
	* tests/morpho_laplacian.cc: New.
	* tests/morpho_hit_or_miss.cc: Update.

	* mln/morpho/plus.hh (mln_postcondition): Remove.
	* mln/morpho/minus.hh: Remove dead lines.
	* mln/morpho/hit_or_miss.hh: Augment doc.
	Add postconditions.
	Add a FIXME.
	* mln/io/save_pgm.hh: Rewrite.
	* mln/arith/plus.hh (plus_cst, plus_cst_inplace): New.
	* img/picasso.pgm: Invert.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@1064 4aad255d-cdde-0310-9447-f3009e2ae8c0