message: Using string instead of path in LandmarkMapper
diff: #define LANDMARKMAPPER_HPP_
  #include "boost/optional.hpp"
  -#include "boost/filesystem/path.hpp"
  #include "boost/property_tree/ptree.hpp"
  #include "boost/property_tree/info_parser.hpp"
  @@ -67,13 +66,13 @@ public:
  * @param[in] filename A file with landmark mappings.
  * @throws runtime_error if there is an error loading the mappings from the file.
  */
  - LandmarkMapper(boost::filesystem::path filename)
  + LandmarkMapper(std::string filename)
  {
  using std::string;
  using boost::property_tree::ptree;
  ptree configtree;
  try {
  - boost::property_tree::info_parser::read_info(filename.string(), configtree);
  + boost::property_tree::info_parser::read_info(filename, configtree);
  }
  catch (const boost::property_tree::ptree_error& error) {
  throw std::runtime_error(string("LandmarkMapper: Error reading landmark-mappings file: ") + error.what());
  