Temporarily include candidates on the overview place page

Issue #535 asks for this - that the default place page at
least shows presidential aspirants.  This is slightly strange with
the structure of the sub-pages for places as they are currently
- it means that the Overview Page now has a superset of what's
on the Candidates page.

Essentially, this is an interim measure until we can rethink
the design again.
Merge branch 'master' into production