Adminstation

# Admin to admin journeys

The idea is to associate a list of 'main stop areas' to the admins and to use only those when going to/leaving an admin.

A new file is thus required (in FusioParser because it is not standard GTFS) ''admin_stations.txt'.

If no main stop areas are available, so continue to start from the center of the admin and go to the reachable stations.