Using python type conversion to return voronoi element color

src/Mod/Path/App/VoronoiCellPyImp.cpp

@@ -123,7 +123,7 @@ Py::Long VoronoiCellPy::getColor(void) const {
   VoronoiCell *c = getVoronoiCellPtr();
   if (c->isBound()) {
     Voronoi::color_type color = c->ptr->color() & Voronoi::ColorMask;
-    return Py::Long(color);
+    return Py::Long(PyLong_FromSize_t(color));
   }
   return Py::Long(0);
 }

src/Mod/Path/App/VoronoiEdgePyImp.cpp

@@ -142,7 +142,7 @@ Py::Long VoronoiEdgePy::getColor(void) const {
   VoronoiEdge *e = getVoronoiEdgePtr();
   if (e->isBound()) {
     Voronoi::color_type color = e->ptr->color() & Voronoi::ColorMask;
-    return Py::Long(color);
+    return Py::Long(PyLong_FromSize_t(color));
   }
   return Py::Long(0);
 }

src/Mod/Path/App/VoronoiVertexPyImp.cpp

@@ -125,7 +125,7 @@ Py::Long VoronoiVertexPy::getColor(void) const {
   VoronoiVertex *v = getVoronoiVertexPtr();
   if (v->isBound()) {
     Voronoi::color_type color = v->ptr->color() & Voronoi::ColorMask;
-    return Py::Long(color);
+    return Py::Long(PyLong_FromSize_t(color));
   }
   return Py::Long(0);
 }