Univention Corporate Server 4.3 erratum 253 (bugfix)

This update addresses the following issue(s):
* The page now scrolls to the top when opening the detail page of
  an UDM object.
* It is now possible to define custom categories for the portal.
* User Templates now have access to the alphanum option.
* The scrolling in the LDAP directory module has been improved.
* The search filter generated for boolean and multi-value properties
  of UDM objects was not correct. This has been resolved.