[Ovmsdev] units

[Mark Webb-Johnson]

I merged this, and it went out last night.

Thanks, Mark.

> On 14 Aug 2018, at 10:23 PM, Robin O'Leary <ovmsdev at caederus.org> wrote:
> 
> I noticed that changing the config option for preferred units caused
> the display of distance on the status page to show the wrong units.
> AsUnitString() correctly converted the value to the desired units,
> but still appended the native unit name.
> 
> While looking at that code, I also noticed that the metric unit
> abbreviations don't conform to standard SI notation:
> - kilometer should be 'km' (not 'Km' because capital-K means Kelvin).
> - kilometers per hour is better as 'km/h' (not 'Kph' because p means pico-).
> 
> Here is a pull request to fix both:
> https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/pull/152
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