build all examples in one go
    - made necessary changes in package cmake files
      for this to work
    - updated documentation in Readme

   -> already in $DD4HEP_LIBRARIES

     Property& operator=(const std::string& val);
   as this is in conflict with explicit instantiation (using string) of:
     template <typename TYPE> Property& operator=(const TYPE& val);
  
   -> Need checking with other compilers !!
 

   (overwrite w/ -D CMAKE_BUILD_TYPE=Debug, Release,...)

    use RegularNgonCartesianGridXY for now
    -> should be (Non)ProjectiveCylinder really
    -> needs fixes 

  (currently seg faults in:
    DD4hep::DDSegmentation::Segmentation::setDecoder () )

DDCore and other packages now depend on DDSegmentation
Segmentation from DDCore now holds a DDSegmentation object that is created during XML parsing
Readout interface extended to act like a full IDDecoder combining information from the volume manage and the DDSegmentation object
TODO: Segmentation could be removed completely, if Readout simply holds a DDSegmentation object
TODO: Missing DDSegmentation classes for cylinders

   the standard Sds that come with it
   -> see SDWrapper.cc
   (exampleN04 now works)

    object to instantiate a G4VSensitiveDetector 
    class
    ->  allows to use pre-existing SD classes 
    -> changed macro DECLARE_SENSITIVEDETECTOR to
       create a factory, thus replace:
       //    typedef Geant4GenericSD<TrackerCombine>  Geant4TrackerCombine;
       typedef SimpleG4SDFactory< Geant4GenericSD<TrackerCombine> >  Geant4TrackerCombine;