- 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
    -...

 - add surfaces to sensitive volumes

 - fixed some issues in Surface classes

   - modified ISurface to be pure abstract base (interface)
      - changed method signatures 
   - added IMaterial as pure abstract base (interface)
   - moved Surface from DDCore to DDRec
     - classes VolSurface (VolPlane, VolCylinder) implement ISurface
     - implement insideBounds using volume
 - changed Vector3D to be copy of gear::Vector3D (slightly improved)