ignore Unicode format characters for normalization

Also adds tests.

Fixes #1007.

test/bdd/db/import/postcodes.feature

@@ -95,7 +95,6 @@ Feature: Import of postcodes
             | object | postcode |
             | W93    | 445023   |
 
-    @wip
     Scenario: Postcodes from admin boundaries are preferred over estimated postcodes
         Given the scene admin-areas
         And the named places

test/bdd/db/query/normalization.feature

@@ -136,3 +136,13 @@ Feature: Import and search of names
         Then results contain
          | ID | osm_type | osm_id |
          | 0  | R        | 1 |
+
+     Scenario: Unprintable characters in postcodes are ignored
+        Given the named places
+            | osm  | class   | type   | address |
+            | N234 | amenity | prison | 'postcode' : u'1234\u200e' |
+        When importing
+        And searching for "1234"
+        Then results contain
+         | ID | osm_type |
+         | 0  | P        |

test/bdd/osm2pgsql/import/tags.feature

@@ -96,6 +96,15 @@ Feature: Tag evaluation
          | N3     | 'name: de' : 'Foo', 'name:\\\\' : 'real3' |
          | N4     | 'name: de' : 'Foo', 'name' : 'rea\\l3' |
 
+    Scenario: Unprintable character in address tag are maintained
+        When loading osm data
+         """
+         n23 Tamenity=yes,name=foo,addr:postcode=1234%200e%
+         """
+        Then place contains
+         | object | address |
+         | N23    | 'postcode' : u'1234\u200e' |
+
     Scenario Outline: Included places
         When loading osm data
          """

test/bdd/steps/db_ops.py

@@ -22,6 +22,8 @@ class PlaceColumn:
             self.add_hstore('extratags', key[6:], value)
         elif key.startswith('addr+'):
             self.add_hstore('address', key[5:], value)
+        elif key in ('name', 'address', 'extratags'):
+            self.columns[key] = eval('{' + value + '}')
         else:
             assert_in(key, ('class', 'type'))
             self.columns[key] = None if value == '' else value