docs: def load_config(settings):
      '''Load settings from configfile'''
      config = ConfigParser()
      section = 'pgdocgen'
      try:
          config.read(settings['configfile'])
      except Exception as e:
          sys.stderr.write('Failed to read config: ' + str(e))
          sys.exit(1)
      for option in config.options(section):
          settings[option] = config.get(section, option)
      return settings