message: Renamed get_all_mappings to get_mappings
  No reason really for the _all_ to be there.
diff: @@ -134,7 +134,12 @@ public:
  return landmark_mappings.size();
  };
  - const auto& get_all_mappings() const {
  + /**
  + * @brief Returns the mappings held by this mapper.
  + *
  + * @return All mappings contained in the mapper.
  + */
  + const auto& get_mappings() const {
  return landmark_mappings;
  };
  