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MPI datatype tweak#1064

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lkotipal wants to merge 7 commits intofmihpc:devfrom
lkotipal:mpi-datatype-tweak
Draft

MPI datatype tweak#1064
lkotipal wants to merge 7 commits intofmihpc:devfrom
lkotipal:mpi-datatype-tweak

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@lkotipal lkotipal commented Nov 27, 2024

Experimental fix for integer overflow in SpatialCell::get_mpi_datatype block lengths.
Uses MPI_UINT32_T for cell transfer datatype since that's the minimum size of all variables communicated.

EDIT: requires more work in dccrg. PR now has displacement and block lengths refactored into a function.

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