Fixed code accidentally left commented out.

Fixed missing cast to Mat_MPIAIJ*.

Change VecScatterCreateWithData() call back to VecScatterCreate().

Broke up monolithic MatCreateKAIJ(); added APIs for setting each part of a KAIJ.

Removed an extra blank line.

MATKAIJ: Fixed simple style and documentation issues noted by Barry and Jed.

Helped-by: Barry Smith <bsmith@mcs.anl.gov>, Jed Brown <jed@jedbrown.org>

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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