Use the new flowMain() function.

Also add it to the CMake file list.

examples/flow_mpi.cpp

@@ -1,2 +1,41 @@
-#define WANT_DUNE_CORNERPOINTGRID 1
-#include "flow.cpp"
+/*
+  Copyright 2013, 2014, 2015 SINTEF ICT, Applied Mathematics.
+  Copyright 2014 Dr. Blatt - HPC-Simulation-Software & Services
+  Copyright 2015 IRIS AS
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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 3 of the License, or
+  (at your option) any later version.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif // HAVE_CONFIG_H
+
+
+#include <dune/grid/CpGrid.hpp>
+#include <opm/autodiff/SimulatorFullyImplicitBlackoil.hpp>
+#include <opm/autodiff/flowMain.hpp>
+
+
+// ----------------- Main program -----------------
+int
+main(int argc, char** argv)
+{
+    typedef Dune::CpGrid Grid;
+    typedef Opm::SimulatorFullyImplicitBlackoil<Grid> Simulator;
+
+    return Opm::flowMain<Grid, Simulator>(argc, argv);
+}