- Bugfix: sys.ini and server.ini: if checkbox is not checked, write default value from tform file into database.

Bugfix: Typo in db_backup path that leads to a crashing daily cron if the backup path does not exist

Changed login = '%u' to (login = '%u' OR email = '%u') in password query of dovecot-sql.conf.master file.

- Removed billing module cron jobs from cron_daily.sh and added billing module container cron job script cron_daily_billing.sh which contains all billing module related daily cron jobs.

- nginx: added security checks when deleting vhost subdomains, so no paths still used by other subdomains or the main web get deleted accidently
- added check for vhostsubdomains to remove beginning and trailing slashes from web path.
- removed check for duplicate folder usage.

 - allowed /web as a base path for vhost subdomains
 - added security checks when deleting vhost subdomains, so no paths still used by other subdomains or the main web get deleted accidently