remove arduino/examples/all directory.

    :rtype: None

def remove_examples_all():
    """remove arduino/examples/all directory.

    :rtype: None

    """
    d = examples_all_dir()
    if d.exists():
        log.debug('remove %s', d)
        d.rmtree()
    else:
        log.debug('nothing to remove: %s', d)