fix compilation warnings

include/curves/curve_abc.h

@@ -65,7 +65,7 @@ struct curve_abc : std::unary_function<Time, Point>, public serialization::Seria
   // Serialization of the class
   friend class boost::serialization::access;
   template <class Archive>
-  void serialize(Archive& ar, const unsigned int version) {
+  void serialize(Archive& /*ar*/, const unsigned int version) {
     if (version) {
       // Do something depending on version ?
     }

python/curves_python.cpp

@@ -538,6 +538,7 @@ namespace curves
       .def("__call__", &bernstein_t::operator())
     ;
     /** END bernstein polynomial**/
+
     /** BEGIN curves conversion**/
     def("polynomial_from_bezier", polynomial_from_curve<polynomial_t,bezier_t>);
     def("polynomial_from_hermite", polynomial_from_curve<polynomial_t,cubic_hermite_spline_t>);