[Tagging] Add some tag to identify disputed borders

[marc marc]

On 12. Nov 2018, at 15:34, Simon Poole<simon at poole.ch>  wrote:
> a consistent set of border polygons 
> (which is what people want in the end).

everybody agree with that, the question was : how ?
i didn't understand very well what you propose to achieve this goal
take one of the initial exemple.
the border IS inconsistent at the moment and I didn't understand
what the concrete solution you're thinking about.
split the disputed area in 2 and use this way as a unique "border"
in the relationship between the 2 countries? why not...