allows globs like `web?.*`, `web[0-9].*`, `web[!34].*` and rejects globs like `invalid..domain` or `this is not a domain name`

* Added validation to prevent conflicts between mail domains and mail transports:

    * When adding a new mail domain, the system now checks for existing mail transports with the same domain.
    * When adding a new mail transport (routing), the system verifies that no mail domain with the same domain exists.

* Cleaned up non-functional code in the mail transport validator.

fixes #6764

#6667

- Use alternatives for jailed shell accounts in Debian/Ubuntu systems instead of an alias
- Made the file /etc/bash.bashrc obsolete
- command_format updated so that the domain placeholder can be used for wget commands
- Introduction of the .bashrc.d directory for shell users so that they can extend their Bash environment more flexibly and easily via resource files
- Minor refactoring and other changes

Avoid running checkzone for each rr when inserting/deleting a soa by deactivating the zone first, #6647

This reverts commit b571cfe7.

Too complex, alterative suggested