Import Geant4 11.4.0 source tree

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+\page Examplegflash1 Example gflash1
+
+## Geometry and SD
+
+This example uses only the mass geometry, with each crystal defined as a volume,
+with parametrisation attached to the envelope in the mass geometry.
+Geometry and sensitive detector are defined in:
+- ExGflash1DetectorConstruction
+- ExGflash1SensitiveDetector
+
+## Details of implementation
+
+To use GFLASH the user has to implement the following:
+
+  - ExGflash1DetectorConstruction::ConstructSDandField() : \n
+    Here GFLASH has to be initialized and assigend to the envelope,
+    where it should be active (here our calorimeter = caloLog )
+    ```cpp
+    // **********************************************
+    // * Initializing shower modell
+    // ***********************************************
+    G4cout << "Creating shower parameterization models" << G4endl;
+    fFastShowerModel = new GFlashShowerModel("fFastShowerModel", fRegion);
+    fParameterisation = new GFlashHomoShowerParameterisation(pbWO4);
+    fFastShowerModel->SetParameterisation(*fParameterisation);
+    fParticleBounds = new GFlashParticleBounds();
+    fFastShowerModel->SetParticleBounds(*fParticleBounds);
+    fHitMaker = new GFlashHitMaker();
+    fFastShowerModel->SetHitMaker(*fHitMaker);
+    G4cout<<"end shower parameterization."<<G4endl;
+    // **********************************************
+    ```
+
+  - ExGflash1SensitiveDetector: \n
+    It is mandatory to use G4VGFlashSensitiveDetector as (additional)
+    base class for the sensitive detector.
+    Here it is necessary to implement a seperate
+    interface, where the GFlash spots are processed.
+    (ProcessHits(G4GFlashSpot*aSpot ,G4TouchableHistory* ROhist))
+    The separate interface is used, because the GFLASH spots contains
+    (naturally) less information than the full simulation.
+
+## 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.