Link Vehicle Capacity Handler

[elizabethc-arup]

We are looking to understand the ratio of passengers traversing a link in a given hour to the total capacity of all vehicles that have done the same traversal, as a result, we were thinking that a LinkVehicleCapacity handler could be very useful for computing the latter total vehicle capacity traversing a link - the LinkVehicleCapacity handler would be very similar to the LinkVehicleCounts handler but instead of summing vehicle counts it will sum the corresponding vehicle capacity of the vehicles that traverses a link.

[elizabethc-arup]

I have started implementing a first version of this new handler in a currently local branch extract-link-pt-capacity by adapting the LinkVehicleCounts Handler as described above. Upon testing the handler, I encountered a legacy issue with the transit_vehicles.xml described in the issue #188 capacity definition structure change in transit_vehicles.xml . Could I please get some advice on what the best approach would be for resolving this? Thank you :)