20081008 - version 3.4.3

Changes:
- changed syntax of domain class to make mnt-by mandatory
- added a new test case for creating a non maintained domain object
- updated several test cases in rdns group to add mnt-by:
- updated Install.pl
- small bugfixes throughout the code


Merged:
- feature-denis-domain_mnt_syntax


Affected stakeholders:
- RIPE NCC DNS WG
- RIPE community
