- updated release notes
   - increased version number
   - set DD4HEP_USE_CXX11 ON

 - updated release notes

   - release notes and versions

   - updated versions and release notes

 - increased version number to v00-07

   part of DD4hep, i.e. no external library option
   - however DDSegementationConfig is created for other packages to 
     build against it
 - changed library versioning of DDSegmentation to be in synch w/ DD4hep
   ( versions and so-versions)
 - some cleanup of geant4 stuff

Export writes information in ~/.cmake/packages, making it hard for cmake not to find ddsegmentation (even when it is removed)

Rename DDSegmentation_INCLUDE_DIR to ..._DIRS
Fix standalone build of DDSegmentation, set DDSegmentation_LIBRARIES in DDSegmentationConfig.cmake
Keep the choice to use external DDSegmentation, set _LIBRARIES and INCLUDE_DIRS in DDSegmentation CMakeLists.txt in case of internal build

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

For now completely decoupled from DDCore only uses BitField64 from there.
Part of the code should replace the Geometry::Segmentation classes