add parameter to choose algorithm for tsp calculation and remove redundant code

data_structures/route_parameters.cpp

@@ -122,6 +122,11 @@ void RouteParameters::setLanguage(const std::string &language_string)
     language = language_string;
 }
 
+void RouteParameters::setTSPAlgo(const std::string &tsp_algo_string)
+{
+    tsp_algo = tsp_algo_string;
+}
+
 void RouteParameters::setGeometryFlag(const bool flag) { geometry = flag; }
 
 void RouteParameters::setCompressionFlag(const bool flag) { compression = flag; }