changed regex for backup_dir (allow empty backup-dir to disable backups)

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

1
ALTER TABLE `mail_user` ADD `disablesieve-filter` ENUM( 'y', 'n' ) NOT NULL DEFAULT 'n' AFTER `disablesieve`;