exclude unnamed highway areas

These are used to mark large paved areas. Sometimes they exists
together with named regular streets. In such cases the unnamed
area may overshadow the actual street when computing the address
parent. As unnamed highways are not very useful anyway, we
simply remove them from the database.

settings/import-address.style

@@ -5,7 +5,7 @@
         "no" : "skip"
     }
 },
-{   "keys" : ["wikipedia", "wikipedia:*", "wikidata"],
+{   "keys" : ["wikipedia", "wikipedia:*", "wikidata", "area"],
     "values" : {
         "" : "extra"
     }

settings/import-full.style

@@ -237,7 +237,8 @@
               "population", "description", "image", "attribution", "fax",
               "email", "url", "website", "phone", "real_ale", "smoking",
               "food", "camera", "brewery", "locality", "wikipedia",
-              "wikipedia:*", "access:*", "contact:*", "drink:*", "toll:*"],
+              "wikipedia:*", "access:*", "contact:*", "drink:*", "toll:*",
+              "area"],
     "values" : {
         "" : "extra"
     }

settings/import-street.style

@@ -1,5 +1,5 @@
 [
-{   "keys" : ["wikipedia", "wikipedia:*", "wikidata"],
+{   "keys" : ["wikipedia", "wikipedia:*", "wikidata", "area"],
     "values" : {
         "" : "extra"
     }