Use transliteration module to canonize urls

I suggest to use transliteration module to make subdomain urls canonical. My kung-fu is too poor to create patch, so I just show my changes, and may be somebody more smart will create patch and submit it.

I have changed function clean() in the includes/subdomain.inc this way

/**
* Prepares subdomain for saving
*/
function clean($raw) {
// Replace spaces with dashes] & convert to lower case. If Transliteration module is installed, use it
if (function_exists('transliteration_clean_filename')) {
return strtolower(str_replace("_", "-",transliteration_clean_filename($raw, language_default('language'))));
} else {
$raw = strtolower(str_replace(" ", "-", $raw));
return preg_replace("/[^a-z-]/", "", $raw);
}
}

I even suggest to add to subdomain settings dropdown "use dash or underscore in the subdomain urls?" and use it in the 3rd row of the function to replace underscores with dashes or not.