message: Core: changed LLG output names.
  Moved image index to front as e.g. `Image-00` in order to have proper file sorting.
diff: @@ -143,32 +143,32 @@ namespace Engine
  std::string preEnergyFile;
  if (this->systems[0]->llg_parameters->output_tag_time)
  {
  - preSpinsFile = this->parameters->output_folder + "/" + starttime + "_Spins";
  - preEnergyFile = this->parameters->output_folder + "/" + starttime + "_Energy";
  + preSpinsFile = this->parameters->output_folder + "/" + starttime + "_Image-" + s_img + "_Spins";
  + preEnergyFile = this->parameters->output_folder + "/" + starttime + "_Image-" + s_img + "_Energy";
  }
  else
  {
  - preSpinsFile = this->parameters->output_folder + "/Spins";
  - preEnergyFile = this->parameters->output_folder + "/Energy";
  + preSpinsFile = this->parameters->output_folder + "/Image-" + s_img + "_Spins";
  + preEnergyFile = this->parameters->output_folder + "/_Image-" + s_img + "_Energy";
  }
  // Function to write or append image and energy files
  - auto writeOutputConfiguration = [this, preSpinsFile, preEnergyFile, s_img, iteration](std::string suffix, bool append)
  + auto writeOutputConfiguration = [this, preSpinsFile, preEnergyFile, iteration](std::string suffix, bool append)
  {
  // File name
  - std::string spinsFile = preSpinsFile + suffix + "_" + s_img + ".txt";
  + std::string spinsFile = preSpinsFile + suffix + ".txt";
  // Spin Configuration
  Utility::IO::Append_Spin_Configuration(this->systems[0], iteration, spinsFile);
  };
  - auto writeOutputEnergy = [this, preSpinsFile, preEnergyFile, s_img, iteration](std::string suffix, bool append)
  + auto writeOutputEnergy = [this, preSpinsFile, preEnergyFile, iteration](std::string suffix, bool append)
  {
  bool normalize = this->systems[0]->llg_parameters->output_energy_divide_by_nspins;
  // File name
  - std::string energyFile = preEnergyFile + suffix + "_" + s_img + ".txt";
  - std::string energyFilePerSpin = preEnergyFile + "-perSpin" + suffix + "_" + s_img + ".txt";
  + std::string energyFile = preEnergyFile + suffix + ".txt";
  + std::string energyFilePerSpin = preEnergyFile + "-perSpin" + suffix + ".txt";
  // Energy
  if (append)
  