Refactoring header layout

lib/cshift/Cshift.h

@@ -0,0 +1,52 @@
+    /*************************************************************************************
+
+    Grid physics library, www.github.com/paboyle/Grid 
+
+    Source file: ./lib/Cshift.h
+
+    Copyright (C) 2015
+
+Author: Peter Boyle <paboyle@ph.ed.ac.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    See the full license in the file "LICENSE" in the top level distribution directory
+    *************************************************************************************/
+    /*  END LEGAL */
+#ifndef _GRID_CSHIFT_H_
+#define _GRID_CSHIFT_H_
+
+#include <Grid/cshift/Cshift_common.h>
+
+#ifdef GRID_COMMS_NONE
+#include <Grid/cshift/Cshift_none.h>
+#endif
+
+#ifdef GRID_COMMS_MPI
+#include <Grid/cshift/Cshift_mpi.h>
+#endif 
+
+#ifdef GRID_COMMS_MPI3
+#include <Grid/cshift/Cshift_mpi.h>
+#endif 
+
+#ifdef GRID_COMMS_MPI3L
+#include <Grid/cshift/Cshift_mpi.h>
+#endif 
+
+#ifdef GRID_COMMS_SHMEM
+#include <Grid/cshift/Cshift_mpi.h> // uses same implementation of communicator
+#endif 
+#endif