Allow connection to different database backends, for now mysql and dblib

conf/metadata.php

@@ -5,7 +5,7 @@
  * @author George Pirogov <i1557@yandex.ru>
  */
 
-
+$meta['type'] = array('multichoice', '_choices' => array('mysql', 'dblib'));
 $meta['Host'] = array('string');
 $meta['DB'] = array('string');
 $meta['user'] = array('string');