Import Geant4 11.4.0 source tree

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+\page Examplegflash2 Example gflash2
+
+## Geometry and SD
+
+This example uses mass geometry to create the main volume (homogeneous material) and use it
+as an envelope for the parametrisation, but the readout geometry (crystals)
+are defined in the parallel geometry, together with the sensitive detector
+to store the hits.
+Geometry and sensitive detector are defined in:
+- ExGflash2DetectorConstruction
+- ExGflash2ParallelWorld
+- ExGflash2SensitiveDetector
+
+## Details of implementation
+
+- ExGflash2.cc: \n
+  Parallel world needs to be registered;
+  Fast simulation is activated for parallel world (where envelope is);
+
+- ExGflash2DetectorConstruction: \n
+  Only main geometry and SD are created;
+
+- ExGflash2ParallelWorld: \n
+  Construction of identical volume for the main box as in the mass geometry,
+  but with dummy material (it is not used anyway);
+  Creation of G4Region associated to G4LogicalVolume;
+  Initialization of GFlash, attaching it to the envelope (G4Region);
+
+- ExGflash2SensitiveDetector: \n
+  Uses pointer to ExGflash2ParallelWorld to get the crystals for the readout;
+
+## Macros
+
+- vis.mac - macro for use in interactive mode (default, if no arguments are specified)
+- test.mac - macro for tests: 50 GeV electrons are shot in the direction of the detector
+           (along z axis), 10 times. As they enter the parametrisation envelope,
+           the GFlash parametrisation is invoked and energy is deposited.
+           The results are printed out:
+            - energy in the most central crystal
+            - energy in 3x3 crystals
+            - energy in 5x5 crystals
+            - number of created deposits
+            - simulation time per event
+
+See also [Category "parameterisations/gflash"](../../html/Examples_gflash.html) documentation.
+