Rename bbox point iterators.
	
	* oln/core/abstract/iterator_on_points.hh
	(p_): Remove.  Abstract classes should not have attributes.
	(to_point): Turn abstract.
	(point_adr): New.
	* oln/core/gen/fwd_piter.hh: Update and rename as...
	* oln/core/gen/bbox_fwd_piter.hh: ...this.
	* oln/core/gen/bkd_piter.hh: Update and rename as...
	* oln/core/gen/bbox_bkd_piter.hh: ...this.
	* oln/core/2d/aliases.hh: Update.
	* oln/core/gen/bbox.hh: Update.
	* oln/basics2d.hh: Update.



git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@551 4aad255d-cdde-0310-9447-f3009e2ae8c0