Properly define fwd_piter_type and bkd_piter_type for the
	add_neighborhood image morpher.
	
	* oln/core/abstract/image_hierarchies.hh: Remove end blank line.
	* oln/core/gen/fwd_piter_bbox.hh (change_topology_): New.
	* oln/core/gen/bkd_piter_bbox.hh (change_topology_): New.
	* oln/morpher/add_neighborhood.hh (morpher_type): Remove; obsolete
	cause defined in super class.
	(fwd_piter_type, bkd_piter_type): New definitions.



git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@566 4aad255d-cdde-0310-9447-f3009e2ae8c0