message: Use parallel_sort to sort distances
diff: #include <gudhi/Internal_point.h>
  +#ifdef GUDHI_USE_TBB
  +#include <tbb/parallel_sort.h>
  +#endif
  +
  #include <vector>
  #include <algorithm>
  #include <limits> // for numeric_limits
  @@ -144,7 +148,11 @@ inline std::vector<double> Persistence_graph::sorted_distances() const {
  for (int v_point_index = 0; v_point_index < size(); ++v_point_index)
  distances.push_back(distance(u_point_index, v_point_index));
  }
  +#ifdef GUDHI_USE_TBB
  + tbb::parallel_sort(distances.begin(), distances.end());
  +#else
  std::sort(distances.begin(), distances.end());
  +#endif
  return distances;
  }
  