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

conf/default.php

@@ -7,6 +7,7 @@
 
 //$conf['fixme']    = 'FIXME';
 
+$conf['type'] = 'mysql';
 $conf['Host'] = 'localhost';
 $conf['DB'] = '';
 $conf['user'] = '';

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');