Added better dovecot version detection in Debian and Ubuntu installer.

Till Brehm

2014-10-18 1fc360dfaf61613735cb635c8e905af2b089cf68

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ALTER TABLE `web_domain` ADD `seo_redirect` VARCHAR( 255 ) default NULL AFTER `redirect_path`;
ALTER TABLE `web_folder_user` ADD `server_id` INT( 11 ) NOT NULL DEFAULT '0' AFTER `sys_perm_other`;