Refresh belgium datasets and make the road-km datasets compatible with triangle inequality
(cherry picked from commit 75ea03d15cd6c53cccc43b015fa251490ec05305)
TSP: rename City to Location + support RoadLocation
(cherry picked from commit 9c14e4ff28d95d4e8c9ce23851a6a6c98c6bf8a1)
TSP: delete old datasets (with Istanbul instead of Ankara)
(cherry picked from commit 3d77d012014c736911e04420a5d69c9886b4ee01)