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Package updates:
* Roundcube updated to version 1.6.6.
* Nextcloud is updated to version 26.0.12.
Mail:
* Updated postfix's configuration to guard against SMTP smuggling to the long-term fix (https://www.postfix.org/smtp-smuggling.html).
Control Panel:
* Improved reporting of Spamhaus response codes.
* Improved detection of SSH port.
* Fixed an error if last saved status check results were corrupted.
* Other minor fixes.
Other:
* fail2ban is updated to see "HTTP/2.0" requests to munin also.
* Internal improvements to the code to make it more reliable and readable.
