Code organisation, splitted headers files in implementation files, as much as possible (impossible for templates functions, thank you C++)

eo/src/mpi/eoMpiNode.cpp

@@ -0,0 +1,19 @@
+# include "eoMpiNode.h"
+
+namespace eo
+{
+    namespace mpi
+    {
+        void Node::init( int argc, char** argv )
+        {
+            static bmpi::environment env( argc, argv );
+        }
+
+        bmpi::communicator& Node::comm()
+        {
+            return _comm;
+        }
+
+        bmpi::communicator Node::_comm;
+    }
+}