message: Fixing big integer issue with recent versions of hypre, in HypreParMatrixFromBlocks.
diff: #include <iomanip>
  #include <cmath>
  #include <cstdlib>
  +#include <climits> // INT_MAX
  using namespace std;
  @@ -1856,6 +1857,11 @@ HypreParMatrix * HypreParMatrixFromBlocks(Array2D<HypreParMatrix*> &blocks,
  (*(blocks(i, j)));
  MFEM_ASSERT(parcsr_op != NULL, "const_cast failed");
  csr_blocks(i, j) = hypre_MergeDiagAndOffd(parcsr_op);
  +#if MFEM_HYPRE_VERSION >= 21600
  + MFEM_VERIFY(csr_blocks(i, j)->num_rows < INT_MAX,"Number of "
  + "local rows is too large to store as an integer.");
  + hypre_CSRMatrixBigJtoJ(csr_blocks(i, j));
  +#endif
  }
  for (int k = 0; k < csr_blocks(i, j)->num_rows; ++k)
  