Customizing units and unit groups

Experimental, maybe removed

Assumes understanding of this part of customizing WeewX http://www.weewx.com/docs/customizing.htm#Creating_a_new_unit_group

[MQTTSubscribeDriver or MQTTSubscribeService]
    [weewx](/bellrichm/WeeWX-MQTTSubscribe/wiki/weewx)
        [[observations](/bellrichm/WeeWX-MQTTSubscribe/wiki/[observations)]
            # Specify group. (Step 1)
            force = group_force

        [[units](/bellrichm/WeeWX-MQTTSubscribe/wiki/[units)]
            # Specify what unit is used to measure force in the three standard unit systems used by weewx. (Step 2)
            [[[pound](/bellrichm/WeeWX-MQTTSubscribe/wiki/[[pound)]]
                unit_system = us
                group = group_force

                # Specify format to use. (Step 3)
                format = '%.1f'
                # Specify label to use. (Step 3)
                label = pound
                # Specify how to convert. (Step 4)
                [[[[conversion](/bellrichm/WeeWX-MQTTSubscribe/wiki/[[[conversion)]]]
                    newton = lambda x : x * 4.44822
            
            # Specify what unit is used to measure force in the three standard unit systems used by weewx. (Step 2)
            [[[newton](/bellrichm/WeeWX-MQTTSubscribe/wiki/[[newton)]]
                unit_system = metric, metricwx
                group = group_force

                # Specify format to use. (Step 3)
                format = %.1f
                # Specify label to use. (Step 3)
                label = newton
                [[[[conversion](/bellrichm/WeeWX-MQTTSubscribe/wiki/[[[conversion)]]]
                    # Specify how to convert. (Step 4)
                    pound = lambda x : x * 0. 224809