Search results can become odd without the country search
terms, so make their inclusion a mandatory part of the
setup.
Also adds a new configuration variable to restrict the
languages taken into account by Nominatim.
Allows to restrict the special phrases imported from the wiki.
Blacklist allows to exclude certain class/type combinations.
Whitelist allows to define an allowed subset of types for a class.
Adjust to your liking in settings/phrase_settings.php before running
the specialphrases script.
