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

Removed possibility of reinstalling Instances

Improved API behaviour: The $params array must contain only the new values and not all values of a record on update. Setting all values does not hurt though, so the change is downwards compatible with older versions.

- Add option to _get functions of the remote-api to return all records when primaryID = -1
- Fixed permission problem in _get functions of remote api.
- Fixed typo in german dashboard language file.

do not change parameter order in old functions

do not change parameter order in old functions

Completly same functionality as VHost-Subdomain, not to disable if already existing vhostalias-somains in system.