* oln/core/3d/image3d.hh, oln/core/3d/array3d.hh,
	* oln/core/3d/point3d.hh, oln/core/3d/dpoint3d.hh,
	* oln/core/3d/neighb3d.hh, oln/core/3d/aliases.hh,
	* oln/basics3d.hh: New.
	* oln/core/abstract/point_set_being_connected.hh
	(oln::abstract::point_set_being_3d_connected): New class.
	(oln::case_<point_set_hierarchy_wrt_connectivity, E, 3>): New
	case.
	* tests/image3d.cc: New test.
	* tests/Makefile.am (check_PROGRAMS): Add image3d.
	(image3d_SOURCES): New.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@605 4aad255d-cdde-0310-9447-f3009e2ae8c0