Additional operations for MATSBAIJ

[Dave May]

Hi guys,
    I would like to inquire whether there are plans to add some MatMatXXX
support (in particular MatPtAP) for the MATSBAIJ types in the next version
of petsc?

The code used in our group combines the FEM with a PIC scheme. The addition
of the particles increase the memory usage significantly, thus we could
really benefit from the memory saved by only storing the upper triangular
part of our global stiffness matrix. The FEM part of the code utilizes
multigrid with Galerkin coarse grid operators constructed via MatPtAP.

Thanks,
    Dave May.
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