Remove materials from LCDD. Look them directly up in the TGeoManager instance and avoid double caching.

   cellIDs to SimTrackerHits in ILDExSimu
   - use ILDCellIDEncoder (needed for MarlinTrk)
   - uses the G4PhysicalVolume CopyNo
   - so far only SIT and VXD
     TPC hits still missing cellIds (and row-volumes)

  - added Property $Id$ to all *.h *.cpp and *.xml files
    to allow versioning with SVN