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.

- Added missing option in centos dovecot.conf file

- Updated version number to 3.0.5.4rc1

- Added function to detect the apache version to installer.
- Added support for apache 2.4 to vhots templates for ispconfig vhost and apps vhost in installer.

This reverts commit 4cd62d78.