Univention Corporate Server 4.1 erratum 222 (bugfix)

This update addresses the following issues:
* Regular users are prevented from changing their object class.
* Users can now only create objects with univentionAdminUserSettings object
  class underneath of "cn=admin-settings".
* Starting the LDAP daemon on i686 systems with a mdb backend
  and a mdb maxsize of at least 2147483648 could potentially fail.
  The init script now triple checks the start.
* Various restrictions for Memberserver and Domaincontrollers have been added
  to the LDAP ACL's.