Address field improvements and bugfixes (closes #3553)
Address field improvements and bugfixes
(closes #3553)

* eliminate duplicate values in suggestions
* set minItems(1) on all combo boxes
* setup dropdowns for all common address fields

digidem/iD,openstreetmap/iD,ngageoint/hootenanny-ui,1ec5/iD,1ec5/iD,openstreetmap/iD,1ec5/iD,AndreasHae/iD,morray/iD,mapmeld/iD,mapmeld/iD,kartta-labs/iD,bagage/iD,morray/iD,kartta-labs/iD,kartta-labs/iD,bagage/iD,bagage/iD,edpop/iD,ngageoint/hootenanny-ui,edpop/iD,mapmeld/iD,AndreasHae/iD,AndreasHae/iD,edpop/iD,digidem/iD,ngageoint/hootenanny-ui,openstreetmap/iD