[RFC] Initial CPU MPI implementation#833

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XapaJIaMnu wants to merge 4 commits into

marian-nmt:masterfrom

XapaJIaMnu:newmpi

Commits on Mar 16, 2021

Commits on Mar 19, 2021

use MPI_IN_PLACE properly
XapaJIaMnu
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Commits on Mar 20, 2021

Remove redundant barriers, update changelog and fix windows compilation
XapaJIaMnu
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