[Tagging] Mapping larger Mini-roundabouts

[Georg Feddern]

> How about diameter=15 on the mini-roundabout node? This is factually 
> correct, verifiable on the ground and (IMHO) non-controversial; 
> routing would not be affected (no need to route over areas) and 
> renderers can draw a bigger blob. Problem solved, simples.

+1 (as to Peter)
I would prefer this method - but would allow the mini-roundabout-tag on 
areas for compatibility reasons - may the latter rest upon 'already 
mapped' or 'stubborn resistance'. ;-)

Georg