Updated paths to PETSc makefile include files.

Use VecScatterCreateWithData() instead of VecScatterCreate().

MATKAIJ: Matrix format for I ⊗ S + J ⊗ T; S,T small and dense, J sparse

This is a generalization of MatMAIJ. The implementation provides
MatMult, MatMultAdd, MatSOR, and InvertBlockDiagonal.

Helpe

MATKAIJ: Matrix format for I ⊗ S + J ⊗ T; S,T small and dense, J sparse

This is a generalization of MatMAIJ. The implementation provides
MatMult, MatMultAdd, MatSOR, and InvertBlockDiagonal.

Helped-by: Jed Brown <jed@jedbrown.org>

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