Replaced SimulatorState -> SimulationDatacontainer

Have removed the SimulatorState base class, and instead replaced with
the SimulationDatacontainer class from opm-common. The SimulatorState
objects were typcially created with a default constructor, and then
explicitly initialized with a SimulatorState::init() method. For the
SimulationDataContainer RAII is employed; the init( ) has been removed -
and there is no default constructor.

tutorials/tutorial2.cpp

@@ -163,10 +163,8 @@ try
     /// <CODE>Opm::IncompTPFA</CODE>.
     /// \snippet tutorial2.cpp state
     /// \internal [state]
-    Opm::TwophaseState state;
-    state.pressure().resize(num_cells, 0.0);
-    state.faceflux().resize(num_faces, 0.0);
-    state.saturation().resize(num_cells, 1.0);
+
+    Opm::TwophaseState state( num_cells , num_faces );
     Opm::WellState well_state;
     /// \internal [state]
     /// \endinternal

tutorials/tutorial3.cpp

@@ -266,8 +266,7 @@ try
     /// initialize water saturation to minimum everywhere.
     /// \snippet tutorial3.cpp two-phase state
     /// \internal [two-phase state]
-    TwophaseState state;
-    state.init(grid.number_of_cells , grid.number_of_faces, 2);
+    TwophaseState state( grid.number_of_cells , grid.number_of_faces );
     initSaturation( allcells , props , state , MinSat );
 
     /// \internal [two-phase state]

tutorials/tutorial4.cpp

@@ -213,8 +213,7 @@ try
     /// initialise water saturation to minimum everywhere.
     /// \snippet tutorial4.cpp two-phase state
     /// \internal[two-phase state]
-    TwophaseState state;
-    state.init(grid.number_of_cells , grid.number_of_faces, 2);
+    TwophaseState state( grid.number_of_cells , grid.number_of_faces );
     initSaturation( allcells , props , state , MinSat );