Only add viewfields for an all-way stop on a highway intersection.
Only add viewfields for an all-way stop on a highway intersection.

Sometimes people tag all-way stop signs at the junction node,
othertimes people tag all-way stop signs at the stop sign location.

What we're doing here is:
- if `stop=all` tagged at the junction, show viewfield in all directions
- if `stop=all` tagged at the sign location, show viewfield according to `direction=` tag

morray/iD,mapmeld/iD,openstreetmap/iD,digidem/iD,bagage/iD,ngageoint/hootenanny-ui,mapmeld/iD,bagage/iD,mapmeld/iD,openstreetmap/iD,kartta-labs/iD,morray/iD,bagage/iD,kartta-labs/iD,AndreasHae/iD,kartta-labs/iD,AndreasHae/iD,openstreetmap/iD,ngageoint/hootenanny-ui,ngageoint/hootenanny-ui,AndreasHae/iD,digidem/iD