add search for postcode

Implements the 'postcode' operator.

sql/functions.sql

@@ -2431,11 +2431,19 @@ BEGIN
   -- %NOAUXDATA% IF 0 THEN
   IF for_place_id IS NULL THEN
     select parent_place_id,'us', housenumber, 30, postcode, null, 'place', 'house' from location_property_aux
-      WHERE place_id = in_place_id 
+      WHERE place_id = in_place_id
       INTO for_place_id,searchcountrycode, searchhousenumber, searchrankaddress, searchpostcode, searchhousename, searchclass, searchtype;
   END IF;
   -- %NOAUXDATA% END IF;
 
+  -- postcode table
+  IF for_place_id IS NULL THEN
+    select parent_place_id, country_code, rank_address, postcode, 'place', 'postcode'
+      FROM location_postcode
+      WHERE place_id = in_place_id
+      INTO for_place_id, searchcountrycode, searchrankaddress, searchpostcode, searchclass, searchtype;
+  END IF;
+
   IF for_place_id IS NULL THEN
     select parent_place_id, country_code, housenumber, rank_search, postcode, name, class, type from placex 
       WHERE place_id = in_place_id and  rank_search > 27

sql/tables.sql

@@ -212,6 +212,7 @@ CREATE TABLE location_postcode (
   geometry GEOMETRY(Geometry, 4326)
   );
 CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (geometry) {ts:address-index};
+GRANT SELECT ON location_postcode TO "{www-user}" ;
 
 CREATE TRIGGER location_postcode_before_update BEFORE UPDATE ON location_postcode
     FOR EACH ROW EXECUTE PROCEDURE postcode_update();