Import Geant4 11.4.0 source tree

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+\page ExampleuserPrimaryGenerator Example userPrimaryGenerator
+
+ The example shows how to create a primary event including several vertices and 
+ several primary particles per vertex
+
+## Geometry construction
+
+ It is a simple box which represents an 'infinite' homogeneous medium.
+  
+## Physics list
+
+ PhysicsList defines only geantino and transportation process.
+
+## Primary generator : several vertices and particles per event
+
+ - vertex A and particle 1 : a geantino uniformly randomized on a cylinder surface.
+ - vertex B and particles 2 and 3 : symetric to vertex A.
+
+## Visualisation
+
+ Visualization Manager is set in the main().
+ Initialisation of the drawing is done via the commands
+ `/vis/..`` in the macro vis.mac. This macro is automatically read from the main 
+ in case of interactive running mode.
+
+## How to start ?
+
+  - execute userPrimaryGenerator in 'batch' mode from macro files
+```
+	% ./userPrimaryGenerator run1.mac
+```
+
+  - execute userPrimaryGenerator in 'interactive mode' with visualization
+```
+	% ./userPrimaryGenerator
+	....
+	Idle>  ---> type your commands. For instance:
+	Idle> /run/beamOn 1
+	....
+	Idle> exit
+```