Update examples and test

Classification/examples/Classification/example_feature.cpp

@@ -107,7 +107,8 @@ int main (int argc, char** argv)
   classifier.set_effect (b, sphericity, Classifier::PENALIZING);
   classifier.set_effect (b, my_feature, Classifier::PENALIZING);
 
-  std::vector<std::size_t> label_indices;
+  std::cerr << "Classifying" << std::endl;
+  std::vector<std::size_t> label_indices(pts.size(), -1);
   Classification::classify_with_graphcut<CGAL::Sequential_tag>
     (pts, Pmap(), labels, classifier,
      neighborhood.k_neighbor_query(12),