Added free method to get the sum of the the faces that are attached to every cell.

opm/core/grid/GridHelpers.cpp

@@ -17,6 +17,11 @@ int dimensions(const UnstructuredGrid& grid)
 {
     return grid.dimensions;
 }
+int numCellFaces(const UnstructuredGrid& grid)
+{
+    return grid.cell_facepos[grid.number_of_cells];
+}
+
 const int* globalCell(const UnstructuredGrid& grid)
 {
     return grid.global_cell;

opm/core/grid/GridHelpers.hpp

@@ -100,6 +100,9 @@ int numFaces(const UnstructuredGrid& grid);
 /// \brief Get the dimensions of a grid
 int dimensions(const UnstructuredGrid& grid);
 
+/// \brief Get the number of faces, where each face counts as many times as there are adjacent faces
+int numCellFaces(const UnstructuredGrid& grid);
+
 /// \brief Get the cartesion dimension of the underlying structured grid.
 const int* cartDims(const UnstructuredGrid& grid);