more small examples for degenerate meshes

Polygon_mesh_processing/examples/Polygon_mesh_processing/remove_degeneracies_example.cpp

@@ -25,6 +25,7 @@ int main(int argc, char* argv[])
     = CGAL::Polygon_mesh_processing::remove_degenerate_faces(mesh);
 
   std::cout << "There were " << nb << " degenerate faces in this mesh" << std::endl;
-
+  mesh.collect_garbage();
+  std::cout << mesh << std::endl;
   return 0;
 }

Polygon_mesh_processing/examples/Polygon_mesh_processing/remove_degeneracies_example_OM.cpp

@@ -28,6 +28,8 @@ int main(int argc, char* argv[])
                                                              geom_traits(K()));
 
   std::cout << "There were " << nb << " degenerate faces in this mesh" << std::endl;
-
+  mesh.garbage_collection();
+  OpenMesh::IO::write_mesh(mesh, "repaired.off");
+  
   return 0;
 }

Polygon_mesh_processing/test/Polygon_mesh_processing/data_degeneracies/degtri_four-2.off

@@ -0,0 +1,13 @@
+OFF
+6 4 0
+0 0 0
+2 0 0
+1 0 0
+0 1 0
+2 1 0
+1 -1 0
+3 0 1 2
+3 0 2 3
+3 2 1 4
+3 1 0 5
+

Polygon_mesh_processing/test/Polygon_mesh_processing/data_degeneracies/degtri_four.off

@@ -0,0 +1,11 @@
+OFF
+5 4 0
+0 0 0
+2 0 0
+1 0 0
+0 1 0
+2 1 0
+3 0 1 2
+3 0 2 3
+3 2 1 4
+3 3 2 4

Polygon_mesh_processing/test/Polygon_mesh_processing/data_degeneracies/degtri_single.off

@@ -0,0 +1,6 @@
+OFF
+3 1 0
+0 0 0
+2 0 0
+1 0 0
+3 0 1 2

Polygon_mesh_processing/test/Polygon_mesh_processing/data_degeneracies/degtri_three.off

@@ -0,0 +1,11 @@
+OFF
+5 3 0
+0 0 0
+2 0 0
+1 0 0
+0 1 0
+2 1 0
+3 0 1 2
+3 0 2 3
+3 2 1 4
+