Increase IP address size for IPv6

Author: tvdhout

src/global/code/Forms.class.php

@@ -986,7 +986,7 @@ public static function finalizeForm($form_id)
 
 		$query .= "submission_date DATETIME NOT NULL,
             last_modified_date DATETIME NOT NULL,
-            ip_address VARCHAR(15),
+            ip_address VARCHAR(39),
             is_finalized ENUM('yes','no') default 'yes')
             Engine=InnoDB DEFAULT CHARSET = $db_table_charset";