message: In Kd_tree::remove, test the point index instead of the coordinates.
diff: @@ -149,7 +149,9 @@ inline int Neighbors_finder::pull_near(int u_point_index) {
  if(!neighbor)
  return null_point_index();
  tmp = neighbor->point_index;
  - kd_t.remove(g.get_v_point(tmp));
  + auto point = g.get_v_point(tmp);
  + int idx = point.point_index;
  + kd_t.remove(point, [idx](Internal_point const&p){return p.point_index == idx;});
  }
  return tmp;
  }
  