Return path list with path segments in the correct direction

[daniel]

Currently the result of the shortest path search returns a list of ordered links. The order of this link list is correct, but there are two cases how to pass each link: - from start to end - from end to start

To show animated routes (ie. play the path as a tour in Google Earth) each link needs to be passed in the correct direction. This might be also convenient for giving driving directions.

[anton]

Done - id field added to the output type. Being sorted by id result becomes ordered.