Select option for Tune Pot on Channel 6 (quadcopter only)

def cmd_tuneopt(self, args):
        '''Select option for Tune Pot on Channel 6 (quadcopter only)'''
        usage = "usage: tuneopt <set|show|reset|list>"
        if self.mpstate.vehicle_type != 'copter':
            print("This command is only available for copter")
            return
        if len(args) < 1:
            print(usage)
            return
        if args[0].lower() == 'reset':
            self.param_set('TUNE', '0')
        elif args[0].lower() == 'set':
            if len(args) < 4:
                print('Usage: tuneopt set OPTION LOW HIGH')
                return
            option = self.tune_option_validate(args[1])
            if not option:
                print('Invalid Tune option: ' + args[1])
                return
            low = args[2]
            high = args[3]
            self.param_set('TUNE', tune_options[option])
            self.param_set('TUNE_LOW', float(low) * 1000)
            self.param_set('TUNE_HIGH', float(high) * 1000)
        elif args[0].lower() == 'show':
            self.tune_show()
        elif args[0].lower() == 'list':
            print("Options available:")
            for s in sorted(tune_options.keys()):
                print('  ' + s)
        else:
            print(usage)