Move bounding box for geocoding into a config variable
Fix bug with not recognising errors in geocoding properly
Override Location.geocode to use a bounding box for biasing

This should make the results more accurately 'Hampshire' most
of the time and combined with a tigher MINIMUM_ACCURACY setting
should get us a good set of results usually
Load all the theme controllers, not just the named one
Basic authorities page
Reinstate Authorities menu item
Annotate hampshire-specific migrations
Calculate authority stats summaries
Use authority_stat_summary info in authority list view