Add an internal timer based on std::clock

 *

 * \brief Implementation of the calculation for a cluster of spheres.

 */

#include <chrono>

#include <cstdio>

#include <exception>

#include <fstream>

 *  \param output_path: `string` Directory to write the output files in.

 */

void cluster(string config_file, string data_file, string output_path) {

  chrono::time_point<chrono::high_resolution_clock> t_start = chrono::high_resolution_clock::now();

  Logger *logger = new Logger(LOG_INFO);

  logger->log("INFO: making legacy configuration...", LOG_INFO);

  ScattererConfiguration *sconf = NULL;

  }

  delete sconf;

  delete gconf;

  chrono::time_point<chrono::high_resolution_clock> t_end = chrono::high_resolution_clock::now();

  const chrono::duration<double> elapsed = t_end - t_start;

  string message = "Calculation lasted " + to_string(elapsed.count()) + ".\n";

  logger->log(message);

  logger->log("Finished: output written to " + output_path + "/c_OCLU\n");

  delete logger;

}