Saving and loading example sets

[Lasitha86]

Saving and loading example sets do not work for windowed examples:

e_type = ExampleType.WINDOWED_EXAMPLE

        # These parameters will be passed to the Example objects upon construction, e.g., all example will have the same
        # window.
        e_kw = {"start": -1536, "n_samples": 7681}
        ev = WindowedExampleValidator()
        ds = DataSet(label_files=label_files, e_type=e_type, example_validator=ev, example_kwargs=e_kw)

        # ds = DataSet(label_files=label_files)
        ds.produce_example_set()
        ds.save_example_set_csv(example_set_path)

    ds = DataSet()
    ds.load_example_set_csv(example_set_path)

[apcarp]

This problem is now fixed in v1.0.2. The ds.load_example_set_csv method accepts e_type and example_kwargs arguments, and the new save files include informational headers that a user may inspect to when deciding which e_type and example_kwargs values should be supplied.