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WIP: Reorganized PtAP for MPIAIJ and MAIJ

Fande Kong requested to merge Fande-Kong/feature_reorganize_ptap into master

It is the second attempt to reorganize PtAP for MPIAIJ and MAIJ. The movitaiton is to be able to select an PtAP algorithm in PCHMG. I want to use allatonce by default because we concern about the memory usage of other algorithms. BTW, allatonce is negligible slower than scalable for realistic problems.

@BarrySmith I am still not sure which way it the right path to reorganize PtAP. If you do not like the current design, please add suggestions.

Edited by Barry Smith

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