Cleans up all the example datasets in the data directory specified by
    ``get_data_home`` either to clear up disk space or start from fresh.

def cleanup_all(data_home=None):
    """
    Cleans up all the example datasets in the data directory specified by
    ``get_data_home`` either to clear up disk space or start from fresh.
    """
    removed = 0
    for name, meta in DATASETS.items():
        _, ext = os.path.splitext(meta['url'])
        removed += cleanup_dataset(name, data_home=data_home, ext=ext)

    print(
        "Removed {} fixture objects from {}".format(removed, get_data_home(data_home))
    )