Change stc_virtual_typedef into oln_virtual_typedef.
	
	* oln/core/macros.hh (oln_virtual_typedef): New macro.
	It replaces stc_virtual_typedef.
	* oln/core/abstract/image.hh: Update.
	* oln/core/abstract/image/mutability/hierarchy.hh: Update.
	* oln/core/abstract/image/neighborhood/hierarchy.hh: Update.
	* oln/core/abstract/image/bbox/hierarchy.hh: Update.
	* oln/core/abstract/point_set.hh: Update.
	* oln/core/abstract/neighborhood.hh: Update.
	* oln/core/abstract/topology.hh: Update.



git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@611 4aad255d-cdde-0310-9447-f3009e2ae8c0