Added prefetching to dovecot to halve database-queries
Added mdbox-creation for new Mailboxes in mdbox-format

Conflicts:
	install/tpl/debian6_dovecot-sql.conf.master
	install/tpl/debian_dovecot-sql.conf.master
	install/tpl/debian_postfix.conf.master
	install/tpl/fedora_dovecot-sql.conf.master
	install/tpl/fedora_postfix.conf.master
	install/tpl/gentoo_postfix.conf.master
	install/tpl/opensuse_dovecot-sql.conf.master
	install/tpl/opensuse_postfix.conf.master
	interface/web/admin/templates/server_config_mail_edit.htm
	server/cron_daily.php
	server/plugins-available/mail_plugin.inc.php
	server/plugins-available/postfix_server_plugin.inc.php

- added intermediate SSL security profile (see https://mozilla.github.io/server-side-tls/ssl-config-generator/)
- TODO: admin option to choose between intermediate (default) and modern

DKIM: changed config-file-check to prevent saving the keys in the wrong file if a single amavis-config-file exists after upgrading to a "split-config"

- upd: better error handling and logging

fixed small bug in mail-backup-cron

Fixed error in Mail-Backup-Cron-Task (created file /dev/nul - missing l)

Fix for mailrestore, to avoid confusion about web- and mail-backups with same ids

additional added mail_backup to webspace-quota if mail and webdomain are on the same server
changed backup-filesize from formated string to byte-count, because of low-level-remote functions

Falko Timme authored Jan 09, 2015 and Patrick Anders committed Jan 09, 2015

- Made sure SQL backups from servers that differ from the server where the website is on can be restored. A download of the backup is not possible in such a case, therefore I hide the "Download" button.

Conflicts:
	interface/lib/classes/plugin_backuplist.inc.php

Removed possibility of reinstalling Instances