message: Fix auto lambda (requires C++14) compilation issue
diff: #include <gudhi/graph_simplicial_complex.h>
  #include <gudhi/Debug_utils.h>
  -#include <boost/function_output_iterator.hpp>
  +#include <boost/function_output_iterator.hpp>
  #include <boost/graph/adjacency_list.hpp>
  #include <iostream>
  @@ -340,12 +340,12 @@ The return value is an `std::map<dim, std::vector<std::pair<birth, death>>>`
  where `dim` is an `int`, `birth` a `double`, and `death` a `double`.
  Note: the function does not check that birth <= death.
  **/
  -std::map<int, std::vector<std::pair<double, double>>> read_persistence_intervals_grouped_by_dimension(std::string const& filename) {
  +inline std::map<int, std::vector<std::pair<double, double>>> read_persistence_intervals_grouped_by_dimension(std::string const& filename) {
  std::map<int, std::vector<std::pair<double, double>>> ret;
  read_persistence_intervals_and_dimension(
  filename,
  - boost::make_function_output_iterator([&ret](auto t) { ret[get<0>(t)].push_back(std::make_pair(get<1>(t), get<2>(t))); }));
  + boost::make_function_output_iterator([&ret](std::tuple<int, double, double> t) { ret[get<0>(t)].push_back(std::make_pair(get<1>(t), get<2>(t))); }));
  return ret;
  } // read_persistence_diagram_from_file
  @@ -360,12 +360,12 @@ The return value is an `std::vector<std::pair<birth, death>>`
  where `dim` is an `int`, `birth` a `double`, and `death` a `double`.
  Note: the function does not check that birth <= death.
  **/
  -std::vector<std::pair<double, double>> read_persistence_intervals_in_dimension(std::string const& filename, int only_this_dim = -1) {
  +inline std::vector<std::pair<double, double>> read_persistence_intervals_in_dimension(std::string const& filename, int only_this_dim = -1) {
  std::vector<std::pair<double, double>> ret;
  read_persistence_intervals_and_dimension(
  filename,
  - boost::make_function_output_iterator([&ret](auto t) { ret.emplace_back(get<1>(t), get<2>(t)); }));
  + boost::make_function_output_iterator([&ret](std::tuple<int, double, double> t) { ret.emplace_back(get<1>(t), get<2>(t)); }));
  return ret;
  } // read_persistence_diagram_from_file
  