Merging Athena and GeoModelATLAS versions of GeoModelXml

GeoModelXML/GeoModelXml/CMakeLists.txt

GeoModelXML/GeoModelXml/GeoModelXml/GmxInterface.h

GeoModelXML/GeoModelXml/GeoModelXml/OutputDirector.h

GeoModelXML/GeoModelXml/data/geomodel.dtd

GeoModelXML/GeoModelXml/src/AddPlane.cxx

GeoModelXML/GeoModelXml/src/AssemblyProcessor.cxx

GeoModelXML/GeoModelXml/src/AssemblyrefProcessor.cxx

GeoModelXML/GeoModelXml/src/Element2GeoItem.cxx

GeoModelXML/GeoModelXml/src/Gmx2Geo.cxx

GeoModelXML/GeoModelXml/src/GmxInterface.cxx

GeoModelXML/GeoModelXml/src/GmxUtil.cxx

GeoModelXML/GeoModelXml/src/IndexProcessor.cxx

GeoModelXML/GeoModelXml/src/LogvolProcessor.cxx

GeoModelXML/GeoModelXml/src/LogvolrefProcessor.cxx

GeoModelXML/GeoModelXml/src/MakeElement.cxx

GeoModelXML/GeoModelXml/src/MakeMaterial.cxx

GeoModelXML/GeoModelXml/src/MakeShaperef.cxx

GeoModelXML/GeoModelXml/src/MakeTransformation.cxx

GeoModelXML/GeoModelXml/src/MakeTransformationref.cxx

GeoModelXML/GeoModelXml/src/MulticopyProcessor.cxx