[BL/MPI.h] In / out buffers must not be aliased
See https://www.mpi-forum.org/docs/mpi-4.1/mpi41-report.pdf page 10 The following error message on JUWELS is fixed with this commit vtkMPICommunicator.cxx:60 WARN| MPI had an error ------------------------------------------------ Invalid buffer pointer, error stack: internal_Allgather(133): MPI_Allgather(sendbuf=0x1233940, sendcount=1, MPI_UNSIGNED_LONG, recvbuf=0x1233840, recvcount=1, MPI_UNSIGNED_LONG, MPI_COMM_WORLD) failed internal_Allgather(85).: Buffers must not be aliased
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