docs: def configure_logger(glob, multi_level,
                       relative=False, logfile=None, syslog=False):
      """
      Logger configuration function for setting either a simple debug mode or a
       multi-level one.
      
      :param glob:        globals dictionary
      :param multi_level: boolean telling if multi-level debug is to be considered
      :param relative:    use relative time for the logging messages
      :param logfile:     log file to be saved (None means do not log to file)
      :param syslog:      enable logging to /var/log/syslog
      """
      levels = [logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG] \
               if multi_level else [logging.INFO, logging.DEBUG]
      try:
          verbose = min(int(glob['args'].verbose), 3)
      except AttributeError:
          verbose = 0
      glob['args']._debug_level = dl = levels[verbose]
      logger.handlers = []
      glob['logger'] = logger
      handler = logging.StreamHandler()
      formatter = logging.Formatter(glob['LOG_FORMAT'], glob['DATE_FORMAT'])
      handler.setFormatter(formatter)
      glob['logger'].addHandler(handler)
      glob['logger'].setLevel(dl)
      if relative:
          coloredlogs.ColoredFormatter = RelativeTimeColoredFormatter
      coloredlogs.install(dl,
                          logger=glob['logger'],
                          fmt=glob['LOG_FORMAT'],
                          datefmt=glob['DATE_FORMAT'], 
                          milliseconds=glob['TIME_MILLISECONDS'],
                          syslog=syslog,
                          stream=logfile)