make dead end always bi-directional

[dkrajzew]

One may find some dead-ends in OSM. Would be ok, but some of them can be passed only in one direction - e.g. away from the road network. As soon as a source is assigned to such a road, no target can be reached.

But it does not make sense, does it? If you are living on a dead end, you should be capable to go back to the major road.