Import Geant4 11.0.0 source tree

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+                         Example clGeometry 
+			 --------------------
+
+This examples demonstrates the usage of the g3tog4 tool for converting 
+Geant 3.21 simple geometries to Geant4 ones.
+
+It requires Geant4 installation with G3toG4 library (
+handled with GEANT4_USE_G3TOG4 option in CMake build or the G4LIB_USE_G3TOG4
+environment variable in GNUmake build).
+
+It demonstrates building a detector geometry using the call list
+mechanism and also provides visualization, see the G3toG4DetectorConstruction
+class. The executable is provided in clGeometry.cc.
+
+The example uses the GunPrimaryGeneratorAction class from the extended examples common 
+repository available in common subdirectory. This class is instatiated in G3toG4ActionInitialization class as it is required for processing with both sequential and multi-threaded Geant4 modes.
+
+To run the application, one must provide as input argument a call list file
+(few test samples are placed in data directory), generated by the rztog4 application
+which can be built typing "make bin" from $G4INSTALL/source/g3tog4.
+Then several optional arguments can be specified to define a macro, UI session 
+or number of threads (applicable only with multi-threading mode):
+
+clGeometry callListFile [-m macro ] [-u UIsession] [-t nThreads]
+
+There is provided clGeometry.in macro which can be executed either interactively 
+or in batch.
+
+For example:
+> clGeometry data/testmodel.dat -m clGeometry.in