GeoModelRead: Fix placement of using directive.

    
Don't put a using directive in the global namespace in headers.

GeoModelIO/GeoModelRead/GeoModelRead/ReadGeoModel.h

@@ -70,10 +70,6 @@ class GeoGraphNode;
 class GeoShapeSubtraction;
 class GeoBox;
 
-// namespaces
-using namespace GeoGenfun;
-//using namespace GeoXF;
-
 
 // type definitions
 typedef const GeoXF::Function & TRANSFUNCTION;