[io] Fix 'apoints' is not defined in addConvexShape
[io] Fix 'apoints' is not defined in addConvexShape

bremond/siconos,siconos/siconos,fperignon/siconos,fperignon/siconos,siconos/siconos,bremond/siconos,bremond/siconos,siconos/siconos,bremond/siconos,fperignon/siconos,fperignon/siconos,radarsat1/siconos,radarsat1/siconos,fperignon/siconos,bremond/siconos,radarsat1/siconos,radarsat1/siconos,radarsat1/siconos,siconos/siconos