Extractor.cpp: sums computed in parallel need to be properly reduced.

[DennisOSRM]

Thanks to @joto's hawk eyes we now know that stats are not properly done in parallel:

case osmium::item_type::node:
  ++number_of_nodes;
  luabind::call_function<void>(
    scripting_environment.getLuaState(),
    "node_function",
    boost::cref(static_cast<osmium::Node &>(*entity)),
      boost::ref(result_node));
    resulting_nodes.push_back(std::make_pair(x, result_node));
 break;

same holds true for number_of_ways and number_of_relations.

[TheMarex]

Should be fixed by #1312 right?

[DennisOSRM]

Yes. Good catch.