to provide some hierarchical strucutre to the geometry

   ( copy did not work ) 

    - ILD examples for now include internal header DetectorInterna.h
  - minor fixes for printing ISurfaces
  - added drawing of z-planes inside tubes (TPC endcap)
  - tried to add copy c'tor foe extension object VolSurfaceList
     -> causes seg. fault ...
     

Hopefully I got the assemblies right now. Assembly test added in examples/ClientTests. Please see also doc/release.notes

 - added drawing for cylinders in Surface.ccp/teve_display
 - added copy ctor and assignment to Vector3D
 -...

   projections of surfaces

     #define use_layer_assembly 1
   results in a seg fault when running:
     ildex_simu  file:../ILDExDet/compact/ILDEx.xml file:../ILDExDet/compact/geant4.xml ../ILDExSimu/run1.mac

This way, one hour bug hunting is skipped.

 - added drawing of LCIO events to teve_display 
   - so far only SimTrackerHits ( tbc) 

 - new method Surface::getVertices() (only planes so far)
 - added some convenient methods to Vector3D

 - include in test_surfaces.cc
 - added Vector3D::fill( double, double, double )

   and compiler warnings about unused variables

   - 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 )

   (up to now now real test - just prints all surfaces ...)

     DetectorSurfaces - view on DetElement that provides access
     to this DetElement's surface(s) 
     SurfaceManager - creates list of all surfaces in a 
     hierarchy of DetElements 
    

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