Import Geant4 11.1.0.beta source tree

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+In this example, the particle fluence is evaluated for a simple set-up,
+consisting of one target solid cylinder, with axis along the z-direction,
+and a beam particle shot before the target along the axis of the target.
+
+The particle fluence is computed in three places: "upstream", "downstream"
+and "side", defined as the positions immediately after, before and aside,
+respectively, of the target with respect to the direction of the primary
+particle.
+
+The particle fluence is estimated by summing the track length in a
+"scoring volume" - i.e. a thin cylinder (for "upstream" and "downstream"
+cases) or a thin hemisphere shell (for the "side" case) filled up with
+G4_Galactic (very low density gas) material, immediately outside the
+target - and then dividing for the cubic volume of such scoring volume.
+
+The particle fluence is evaluated for the following 11 particle types:
+-  all
+-  electron + positron 
+-  gamma
+-  muon- + muon+
+-  neutrino (any flavour and including anti-neutrino)
+-  charged pions
+-  neutron + anti_neutron
+-  proton + anti_proton
+-  ion (and anti-ions)
+-  otherMeson (e.g. kaons, etc.)
+-  otherBaryon (e.g. hyperons, etc.)
+
+The particle fluence is evaluated for the following 3 kinematical ranges:
+-  any kinetic energy
+-  kinetic energy < 20 MeV
+-  kinetic energy > 20 MeV
+
+Look for the string "***LOOKHERE***" for those parameters/options that
+are either hardwired in the code (i.e. not available via UI command),
+or default values of UI commands.
+
+This example uses the physics list factory, therefore you can specify
+the reference physics list you want to use via the PHYSLIST
+environmental variable (by default, if you don't set it, the FTFP_BERT
+physics list is used).
+
+To build this example:
+
+  mkdir Build; cd Build
+  cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+        -DGeant4_DIR=/path-to-geant4-libraries ../.
+  make
+
+To run it:
+
+  ./Layer all_together.g4
+
+which shoots 50 GeV pion- on different target materials, 100 events
+in each run, and print out some information on the particle fluence
+at the end of each run.
+Other macros exist for specific materials.