- see ILDExDet/src/ILDExVXD_geo.cpp and
     ILDExSimu/src/test_surfaces.cc as examples
     on how to use them
  - moved example test_surfaces to ILDExSimu 
     ( tests if hits created in simulation are on the surface)
  - fixed Surface::distance and Surface::insideBounds to
    call the correct methods for planes and cylinders
    ( handles are not polymorphic -> might be better to change
      VolSurface into plain class )

    - access to materials
    - insideBounds()
    - print methods
    -...

  - fixed env scripts
  - increased version to v00-06
  - updated documentation

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