Allow faceting for world locations, policy areas and taxons
Allow faceting for world locations, policy areas and taxons

World locations and policy areas are used in the whitehall finders like
https://www.gov.uk/government/announcements. We're building new finders
for those, so to keep feature parity we need to be able to facet on
those attributes.

The taxons facet we'd like to use to experiment in finders too.

alphagov/rummager,alphagov/rummager