Merge remote-tracking branch 'origin/release'
Merge branch 'barry/2021-02-20/fix-mpi4py-check-docs/release' into 'release'Add test for mpi4py and clearer error message on how to PYTHONPATH to use mpi4pySee merge request petsc/petsc!3639
Add test for mpi4py and clearer error message on how to PYTHONPATH to use mpi4pyCommit-type: error-checking,testing-fix,feature,example/spend 2h