Fixed #4211 Admin theme breaks when set to blue skin and then upgrading to 3.1rc2

Added fields user_config and user_type to the ftp_user table.

install/sql/incremental/upd_0084.sql

+UPDATE `sys_user` SET `app_theme` = 'default' WHERE 1;
+ALTER TABLE `ftp_user` ADD `user_type` SET('user','system') NOT NULL DEFAULT 'user' AFTER `expires`, ADD `user_config` TEXT NULL AFTER `user_type`;
\ No newline at end of file

install/sql/ispconfig3.sql

@@ -644,6 +644,8 @@ CREATE TABLE `ftp_user` (
   `ul_bandwidth` int(11) NOT NULL default '-1',
   `dl_bandwidth` int(11) NOT NULL default '-1',
   `expires` datetime NULL DEFAULT NULL,
+  `user_type` set('user','system') NOT NULL DEFAULT 'user',
+  `user_config` text,
   PRIMARY KEY  (`ftp_user_id`),
   KEY `active` (`active`),
   KEY `server_id` (`server_id`),