docs: def _make_opt_list(opts, group):
      """Generate a list of tuple containing group, options
  
      :param opts: option lists associated with a group
      :type opts: list
      :param group: name of an option group
      :type group: str
      :return: a list of (group_name, opts) tuples
      :rtype: list
      """
      import copy
      import itertools
  
      _opts = [(group, list(itertools.chain(*opts)))]
      return [(g, copy.deepcopy(o)) for g, o in _opts]