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Adds columns to stop_times (arrival_time_hms, departure_time_hms) and frequencies (start_time_hms, end_time_hms) with times converted with hms::hms().
set_hms_times(gtfs_obj)
a gtfs object in which hms times should be set, the modified gtfs_obj is returned
gtfs_obj with added hms times columns for stop_times and frequencies