Univention Corporate Server 4.2 erratum 74 (bugfix)

This update addresses the following issue(s):
* Group and user objects can now be copied in UMC.
* The <:umlauts> modifier in the templating mechanism of e.g. user
  templates now normalizes all characters.
* When creating policy objects the DN of the created object is returned.
* The LDAP base could not be modified via UMC anymore since erratum 39.
  This has been fixed.
* An error in the UDM python interface has been fixed which caused that
  default values containing template variables (e.g. the mail property
  of a user) were not reset resulting in wrong default values if multiple
  objects were created at once.