Hacky BIND modification seems not to be needed, just run the acme.sh command in the background and the next server cron will create the needed DNS records (#4202)

Add check for PowerDNS as DNS-01 verification is currently not supported when using a single server AND PowerDNS, and add function to modify BIND zonefile on single server setups (#4202)

Merge branch '6430-php8-unable-to-add-database-on-multiserver-setup-withs-eparate-db-server' into 'develop'

Resolve "PHP8: Unable to add database on multiserver setup withs eparate DB server"

Closes #6430

See merge request ispconfig/ispconfig3!1673

Unlimited quota is stored as -1, not zero, #6417

Closes #6417

See merge request !1668

Mark usage column for php sorting, #6418

Closes #6418

See merge request ispconfig/ispconfig3!1669

PHP 8 strict fixes, #6419

Closes #6419

See merge request ispconfig/ispconfig3!1670

Fixed typo. Wrong "subjectAltName" with leading dot when using self-signed certificates.

See merge request ispconfig/ispconfig3!1671

APS deletion follows symlink

See merge request !1666

Resolve "Change default URL of phpmyadmin and webmail to apps vhost"

Closes #6415

See merge request ispconfig/ispconfig3!1665

add mail_relay_domain API functions #6399

See merge request ispconfig/ispconfig3!1644

Fix var name issue crippling vhost_rewrite_v6?

Closes #6414

See merge request ispconfig/ispconfig3!1663