Univention Corporate Server 4.2 erratum 83 (bugfix)

This update addresses the following issue(s):
* Overwritten syntax classes for properties which are shown in a
  wizard for creating objects can now use ComboBox widgets.
* The options of objects are now sorted.
* A crash is prevented if a default container contained special characters
  like ",".
* A possible crash when loading widget definitions for UDM properties is now
  prevented.