Inserted incremental sql from master branch

install/sql/incremental/upd_0064.sql

+ALTER TABLE `mail_user` ADD `disablelmtp` ENUM( 'n', 'y' ) NOT NULL DEFAULT 'n' AFTER `disablelda` ;
+ALTER TABLE `mail_user` CHANGE `uid` `uid` INT( 11 ) NOT NULL DEFAULT '5000', CHANGE `gid` `gid` INT( 11 ) NOT NULL DEFAULT '5000' ;
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