move country search term creation into setup script

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.

settings/defaults.php

@@ -11,6 +11,13 @@ if (isset($_GET['debug']) && $_GET['debug']) @define('CONST_Debug', true);
 @define('CONST_Database_Web_User', 'www-data');
 @define('CONST_Max_Word_Frequency', '50000');
 @define('CONST_Limit_Reindexing', true);
+// Restrict search languages.
+// Normally Nominatim will include all language variants of name:XX
+// in the search index. Set this to a comma separated list of language
+// codes, to restrict import to a subset of languages.
+// Currently only affects the import of country names and special phrases.
+@define('CONST_Languages', false);
+
 // Set to false to avoid importing extra postcodes for the US.
 @define('CONST_Use_Extra_US_Postcodes', true);
 /* Set to true after importing Tiger house number data for the US.

settings/phrase_settings.php

@@ -2,42 +2,6 @@
 
 // These settings control the import of special phrases from the wiki.
 
-// Languages to download the special phrases for.
-$aLanguageIn
- = array(
-    'af',
-    'ar',
-    'br',
-    'ca',
-    'cs',
-    'de',
-    'en',
-    'es',
-    'et',
-    'eu',
-    'fa',
-    'fi',
-    'fr',
-    'gl',
-    'hr',
-    'hu',
-    'ia',
-    'is',
-    'it',
-    'ja',
-    'mk',
-    'nl',
-    'no',
-    'pl',
-    'ps',
-    'pt',
-    'ru',
-    'sk',
-    'sv',
-    'uk',
-    'vi',
-   );
-
 // class/type combinations to exclude
 $aTagsBlacklist
  = array(