print mouse input points and segments

Signed-off-by: Panagiotis Cheilaris <philaris@cs.ntua.gr>

GraphicsView/demo/Segment_Delaunay_graph_Linf_2/Segment_voronoi_2.cpp

@@ -81,6 +81,7 @@ private:
       if(p != q){
         wh = svd.insert(*it);
         svd.insert(vh,wh);
+        std::cout << "s " << p << " " << q << std::endl;
         vh = wh;
         p = q;
       } else {
@@ -210,6 +211,7 @@ MainWindow::processInput(CGAL::Object o)
   if(CGAL::assign(points, o)){
     if(points.size() == 1) {
       svd.insert(points.front());
+      std::cout << "p " << points.front() << std::endl;
     }
     else {
       /*