Relinquish row/nnz control to linsys assembler.

Pass the scalar number of rows and non-zeros into .setSize() along
with the number of degrees of freedom per cell.  This allows the
assembler to impose block structure in an optimal way for each
particular type of linear system.

src/ImplicitAssembly.hpp

@@ -55,11 +55,8 @@ namespace Opm {
             sz_t m   = g.number_of_cells;
             sz_t nnz = g.number_of_cells + countConnections(g);
 
-            m   *= DofPerCell;
-            nnz *= DofPerCell * DofPerCell;
-
-            sys.matrix().setSize(m, m, nnz);
-            sys.vector().setSize(m);
+            sys.matrix().setSize(DofPerCell, m, m, nnz);
+            sys.vector().setSize(DofPerCell, m);
         }
 
         template <class ReservoirState,

src/JacobianSystem.hpp

@@ -197,7 +197,7 @@ namespace Opm {
             finalizeStructure();
 
             void
-            setSize(size_t m, size_t n, size_t nnz = 0);
+            setSize(size_t ndof, size_t m, size_t n, size_t nnz = 0);
 
             const Matrix&
             matrix();