Add total km per year and total kWh per year to summary_vehicles_cost

[j-brendel]

Add "total_km_per_year", "total_kWh_from_grid" and "total_kWh_from_feed_in" to summary_vehicles_cost.

Similar to gc_overview.csv: Please also add the infos "station_type" (only at individual stations), "maximum_gc_power" (in cumulated just as the sum without regard if peaks are simultaneously), "maximum Nr charging stations" (the same way as they are implemented in "gc_overview"). It makes it much easier if all the info is in one place, even if this means some rednundancy.

If possible in each line i.e. for each electrified station. km should be allocated by the sum of the length of all rotations that leave the specific depot (not that end at specific depots - only relevant if start and end is not at the same depot)

The columns should be added after the columns for "nr of vehicles" and before the individual costs.

[j-brendel]

soved in #201