Univention Corporate Server 4.0 erratum 266 (bugfix)

This update addresses the following issues:
* The query string parameters are now passed to automatically started UMC
  modules.
* The handling of the UMC overview page on mobile devices has been improved.
* A race condition in the UMC webserver has been fixed which could lead to
  failing starts of the UMC webserver.
* The PID file is no longer created world-writable.
* Behaviour and appearance of tooltips has been changed. Tooltips will no
  longer automatically pop up and need to be opened manually by clicking
  the tooltip icon.
* The module header in UMC modules now sticks smoothly to the top when
  scrolling down.
* The browser next/back buttons have been integrated into UMC in order to
  simplify its navigation.