Adding geometry-free zone-system #3423
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Sometimes geometry-based zonal system cannot handle the irregularity in the network (e.g., rivers/bridges, one-way-roads, ramps). A geometry-free zonal system may be desirable.
In this PR, an interface for the generation of a geometry-free zonal system is implemented. The zone-system will be built according to the special attribute stored in the network (node and link).
A network preparation script based on a simple heuristic has been implemented (MaxTravelTimeBasedZoneGenerator). A run script to use the generator is also added (PrepareMaxTravelTimeBasedZonalSystem). These two scripts are in the application-contrib.