Use CloudFlare as a source for IP2Locale module

CloudFlare has a nice feature where they pass the country of the visitor in a HTTP header.

This can then be used by various modules, like the IP2Locale module http://drupal.org/project/ip2locale

To use the feature, and provide it to other modules, all you need is to add this bit at the end of cloudflare.module

// Extension for the backend of ip2locale.
function cloudflare_get_country(){
  return $_SERVER['HTTP_CF_IPCOUNTRY'];
}