Update image_extension, add_neighborhood, and some related
	classes.
	
	* oln/automatic/image.hh: New.
	* oln/core/abstract/image.hh: Include oln/automatic/image.hh.
	Inherit from automatic::impl.
	(has): Add FIXME.
	* oln/core/abstract/image_having_neighborhood.hh (neighborhood):
	Change so that it relies on topo().  impl_neighborhood() is now
	obsolete in image classes.
	* oln/core/2d/aliases.hh (topo2d, fwd_piter2d, bkd_piter2d):
	Update aliases.
	* oln/basics2d.hh: Update.
	* oln/core/2d/image2d.hh (topo2d, fwd_piter2d, bkd_piter2d):
	Update and make them explicit.
	(ctor): Add border argument with default.
	(impl_op_read): Change fake code.
	* oln/core/2d/neighb2d.hh: Cosmetics.
	* oln/core/gen/bbox.hh: Include files for piter types.
	* oln/morpher/internal/image_extension.hh (morpher_type): New.
	This class thus factors this definition.
	(impl_topo, impl_op_read, impl_has): Remove.  These methods
	are expected to be automatically fetch from top implementation
	classes.
	(self_t, image_t, topo_t, value_t, point_t): Remove cause obsolete.
	* oln/morpher/add_neighborhood.hh (add_neighborhood): Add second
	parameter Neighb.
	(include, set_super_type): Update.
	(neighborhood_type): Change.
	(ctor): Update.
	(impl_neighborhood): Remove.
	(impl_topo): New.
	(nbh_): Remove.
	(topo_): New.
	* tests/add_neighborhood_morpher.cc: Update.
	* tests/morphers.cc: Update.



git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@565 4aad255d-cdde-0310-9447-f3009e2ae8c0