Mechanism for adding a default URL fragment to a canned query

Closes #767

tests/fixtures.py

@@ -327,6 +327,7 @@ METADATA = {
                     ),
                     "title": "Search neighborhoods",
                     "description_html": "<b>Demonstrating</b> simple like search",
+                    "fragment": "fragment-goes-here",
                 },
             },
         }