export copy constructors of vector classes

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2269 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/geom/pymod/export_vec2.cc

@@ -30,6 +30,7 @@ void export_Vec2()
 
   class_<Vec2>("Vec2",init<>())
     .def(init<Real,Real>())
+    .def(init<const Vec2&>())
     .def(init<const Vec3&>())
     .def(init<const Vec4&>())
     .def(self *= Real())

modules/geom/pymod/export_vec3.cc

@@ -38,6 +38,7 @@ void export_Vec3()
     .def(init<Real,Real,Real>())
     .def(init<const Vec2&>())
     .def(init<const Vec4&>())
+    .def(init<const Vec3&>())
     .def(self *= Real())
     .def(self /= Real())
     .def(self += Real())

modules/geom/pymod/export_vec4.cc

@@ -35,6 +35,7 @@ void export_Vec4()
     .def(init<Real,Real,Real,Real>())
     .def(init<const Vec2&>())
     .def(init<const Vec3&>())
+    .def(init<const Vec4&>())
     .def(self *= Real())
     .def(self /= Real())
     .def(self += Real())