change cc and sender_cc column type to text to support more than 4-5 redirects

Author: renky

install/sql/ispconfig3.sql

@@ -1038,8 +1038,8 @@ CREATE TABLE `mail_user` (
   `maildir` varchar(255) NOT NULL default '',
   `maildir_format` varchar(255) NOT NULL default 'maildir',
   `quota` bigint(20) NOT NULL default '-1',
-  `cc` varchar(255) NOT NULL default '',
-  `sender_cc` varchar(255) NOT NULL default '',
+  `cc` text,
+  `sender_cc` text,
   `homedir` varchar(255) NOT NULL default '',
   `autoresponder` enum('n','y') NOT NULL default 'n',
   `autoresponder_start_date` datetime NULL default NULL,