Fix/tests

[PaulScheerRLI]

Included fixes:

• Make test_simulate more robust, by adding a developer mode setting in the args.
  If args.propagate_mode_errors is set to True, mode simulation will reraise errors to allow for better testing.

• Make test_schedule more robust
  test_get_negative_rotations is more clear by making it apparent why which rotations should be negative
  test_get_negative_rotations was influenced by testing the consumption, since changes in vehicle_types propagted through the test. This has been fixed by using a deepcopy of vehicle types for consumption mutation,
  basic_run in test_schedule was refactored making it more readable and making use of the new simulate functionality "pre_simulate"

[stefansc1]

You will need to update util.get_args as well to include the propagate_mode_errors setting. Otherwise, it will not be defined normally and the program will crash when a mode runs into an error.