Move GridManager to grid subdir.

Also remove GridAdapter (moved to dune-cornerpoint), and
moved grid.c implementation file to grid subdir.

tests/not-unit/test_ert.cpp

@@ -20,7 +20,7 @@
 
 #include "config.h"
 #include <opm/core/eclipse/EclipseGridParser.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/grid/cart_grid.h>
 #include <opm/core/grid.h>
 #include <cstdio>

tests/test_column_extract.cpp

@@ -9,7 +9,7 @@
 #define BOOST_TEST_MODULE ColumnExtractTest
 #include <boost/test/unit_test.hpp>
 #include <opm/core/utility/ColumnExtract.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/io/eclipse/EclipseGridParser.hpp>
 
 #include <cstddef>

tests/test_dgbasis.cpp

@@ -28,7 +28,7 @@
 #include <boost/test/unit_test.hpp>
 
 #include <opm/core/transport/reorder/DGBasis.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/grid.h>
 #include <cmath>
 

tests/test_quadratures.cpp

@@ -30,7 +30,7 @@
 
 #include <opm/core/grid/CellQuadrature.hpp>
 #include <opm/core/grid/FaceQuadrature.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/grid.h>
 #include <cmath>
 

tests/test_velocityinterpolation.cpp

@@ -28,7 +28,7 @@
 #include <boost/test/unit_test.hpp>
 
 #include <opm/core/utility/VelocityInterpolation.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/grid.h>
 #include <cmath>
 

tests/test_wachspresscoord.cpp

@@ -28,7 +28,7 @@
 #include <boost/test/unit_test.hpp>
 
 #include <opm/core/utility/WachspressCoord.hpp>
-#include <opm/core/GridManager.hpp>
+#include <opm/core/grid/GridManager.hpp>
 #include <opm/core/grid.h>
 #include <cmath>