Query the lineage of the current timer level.  Provides only timer names,
    not stamp names (as these have not been decided yet!).

    Returns:
        str: Formatted sequence of timer names in one string.

def get_active_lineage():
    """
    Query the lineage of the current timer level.  Provides only timer names,
    not stamp names (as these have not been decided yet!).

    Returns:
        str: Formatted sequence of timer names in one string.
    """
    lin_str = ''
    for active_timer in f.timer_stack:
        lin_str += "{}-->".format(active_timer.name)
    try:
        return lin_str[:-3]
    except IndexError:
        pass