#49 Extends sanitize db command

* extends sanitize db command to remove unrelated parcels and district from the database
* fixes bug where single parcel wfs match would lead to unexpected behaviour
* adds admin interface for parcels and districts
* adds updating of parcels in case of SimpleGeomForm saving

konova/utils/wfs/spatial.py

@@ -158,10 +158,16 @@ class ParcelWFSFetcher(AbstractWFSFetcher):
                 "wfs:FeatureCollection",
                 {},
             )
-            features += collection.get(
+
+            members = collection.get(
                 "wfs:member",
                 [],
             )
+            if len(members) > 1:
+                features += members
+            else:
+                features += [members]
+
             if collection.get("@next", None) is not None:
                 start_index += self.count
             else: