Added using statements

Nef_3/include/CGAL/Nef_3/SNC_constructor.h

@@ -197,6 +197,8 @@ public:
   typedef typename SM_const_decorator::SHalfedge_around_svertex_const_circulator 
                                        SHalfedge_around_svertex_const_circulator; 
 
+  using SNC_decorator::is_standard;
+  
   enum{NORMAL, CORNER, DEGENERATE};
 
   SNC_constructor_base( SNC_structure& W) : SNC_decorator(W) {}

Nef_3/include/CGAL/Nef_polyhedron_3.h

@@ -331,6 +331,10 @@ protected:
 
   typedef typename SNC_decorator::Association  Association;
 
+
+ using Decorator::is_standard;
+ using Decorator::is_bounded;
+ 
  protected: 
   void initialize_infibox_vertices(Content space) {
     SNC_constructor C(snc());