Import Geant4 9.1.0 source tree

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+$Id: README,v 1.1 2007/11/16 13:32:56 kmura Exp $
+==========================================================================
+Geant4 MPI Interface
+
+  Author:
+  Koichi Murakami (KEK) / Koichi.Murakami@kek.jp
+==========================================================================
+
+How to build
+============
+
+1. Check "G4MPI.gmk" for yor MPI configuration:
+
+* Set "G4MPIROOT", which is the root path to your MPI library.
+* Redifine CXX as (wrapped) MPI C++ compiler.
+* Specify additional include paths and compiler flags to "CPPFLAGS".
+
+Sample makefiles for (LAM, MPICH2, OpenMPI) are also presented.
+An example of "G4MPI.gmk":
+
+  # ===========================================================
+  #  Makefile for building G4MPI (LAM)
+  # ===========================================================
+
+  ifndef G4MPIROOT
+    G4MPIROOT = /opt/lam
+  endif
+
+  # additional flags
+  CXX := mpic++
+  CPPFLAGS += -I$(G4MPIROOT)/include
+
+
+2. Build the library
+
+# make
+# make includes
+
+The library (libG4UImpi) will be created in $G4LIB, 
+and header files will be installed into $G4INCLUDE.
+