added result_of::point_type sepcializations added viennagrid::point specializations adapted viennagrid::create_element<PLC>
added result_of::point_type sepcializations
added viennagrid::point specializations
adapted viennagrid::create_element<PLC>

viennagrid/viennagrid-dev,viennagrid/viennagrid-dev,viennagrid/viennagrid-dev