- deleted writeXMLDescription_legacy
  * the old data structure allowed to write changes applied to the
    XML objects to be written persistently. With the new data
    structure the XML object has a method writeXML which allows
    to write the current data set in the XML format. The work
    on the XML writer is not yet finished. Thus the support for
    writing changes back to the XML will be added back at a later
    point in time.
- moved split tmp/persistent files handling to the new data structure
  Along with the change the following legacy functions were deleted:
  * getSplitPersistentExceptions_legacy
  * getSplitPersistentFiles_legacy
  * getSplitTempExceptions_legacy
  * getSplitTempFiles_legacy