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Initialize DIY in vtkm::cont::Initialize

Kenneth Moreland requested to merge kmorel/vtk-m:mpi-init into master

This has the side effect of initialing MPI_Init (and will also call MPI_Finalize at program exit). However, if the calling code has already called MPI_Init, then nothing will happen. Thus, if the calling code wants to manage MPI_Init/Finalize, it can do so as long as it does before it initializes VTK-m.

Backport: release

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