Company and person fields in search form

Added name:, company.name:, last:, first:, and title: to search form.
Search form country uses Select2

The search form country field uses Select2 to aid the user to quickly
find the country name (and therefore the country code) they are looking
for.
Renamed Advanced to Search

Started out calling it Advanced Search and ended up calling it search.
Let's let the URL reflect the true meaning.