Univention Corporate Server 4.2 erratum 64 (bugfix)

This update addresses the following issue(s):
* Errors during connecting to the LDAP server are now handled.
* Errors during module initialization are now handled.
* The SSL security of the UMC server has been strengthened by disabling
  SSLv3 and making the TLS Ciphers configurable via UCR.
* The build utilities have been adjusted to enhance the creation of
  translation packages.