MPI support #316

Job	Run time
static builds (ubuntu-latest, stable)	1m 14s
static builds (ubuntu-latest, stable)	1m 14s
mpi-runner	1m 36s
mpi-runner	1m 36s
static builds (windows-latest, stable-msvc)	6m 37s
static builds (windows-latest, stable-msvc)	6m 37s
Address sanitizer	1m 26s
Address sanitizer	1m 26s
conda (ubuntu, conda-forge, stable)	52s
conda (ubuntu, conda-forge, stable)	52s
static builds (windows-latest, stable-gnu)	7m 4s
static builds (windows-latest, stable-gnu)	7m 4s
conda (windows, conda-forge, stable)	3m 5s
conda (windows, conda-forge, stable)	3m 5s
rustfmt	1m 44s
rustfmt	1m 44s
static builds (macos-11, stable)	1s
static builds (macos-11, stable)	1s
conda (macos, conda-forge, stable)	1m 19s
conda (macos, conda-forge, stable)	1m 19s
test apt (stable)	42s
test apt (stable)	42s
static builds (macos-latest, stable)	3m 5s
static builds (macos-latest, stable)	3m 5s
test apt (beta)	45s
test apt (beta)	45s
test apt (nightly)	1m 1s
test apt (nightly)	1m 1s
	1h 1m 2s

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