Use dovecot or maildrop in default-cases
Switching to LMTP and back included in server-postfix-plugin
validator added to disable switching uid-mapping when already created mailusers or in multiserver-environment

change sys_userid and sys_groupid for webdav users, web folders, web folder users, cron, database users and aps instances when domain's owner is changed

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