code: def linkify(self, timeperiods, commands):
          
          self.linkify_with_timeperiods(timeperiods, 'check_period')
          self.linkify_one_command_with_commands(commands, 'check_command')
docs: Replace check_period by real Timeperiod object into each CheckModulation
          Replace check_command by real Command object into each CheckModulation
  
          :param timeperiods: timeperiods to link to
          :type timeperiods: alignak.objects.timeperiod.Timeperiods
          :param commands: commands to link to
          :type commands: alignak.objects.command.Commands
          :return: None