Force a GTFS to be valid by removing problems
gtfs_force_valid(gtfs)Actions performed 1. Remove stops with missing location 2. Remove routes that don't exist in agency 3. Remove trips that don't exist in routes 4. Remove stop_times(calls) that don't exist in trips 5. Remove stop_times(calls) that don't exist in stops 6. Remove Calendar that have service_id that doesn't exist in trips 7. Remove Calendar_dates that have service_id that doesn't exist in trips