remove board.

    :param board_id: board id (e.g. 'diecimila')
    :rtype: None

def remove_board(board_id):
    """remove board.

    :param board_id: board id (e.g. 'diecimila')
    :rtype: None

    """

    log.debug('remove %s', board_id)
    lines = boards_txt().lines()
    lines = filter(lambda x: not x.strip().startswith(board_id + '.'), lines)
    boards_txt().write_lines(lines)