Merge remote-tracking branch 'origin/release'

petscviewer: fix the fortran bindings of XXXViewFromOptions when called with obj=PETSC_NULL_XXX

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-pro

Convert MPI error type to PETSc error with string message for all MPI calls

Now PETSc examples will ONLY return PETSc error codes and never MPI error codes directly so we can understand and post-process their
errors better.

The test harness will now automatically retry tests that fail with MPI, this may help with Intel MPI that produces
seemingly random failures.

Commit-type: error-checking
/spend 30m

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Plex: Simple partitioner can now make grid partitions
SNES ex13: Benchmark problem now uses Simple grid partitioning

test: Fix bad requires and filter in PetscPartitioner test

PetscPartitioner: Full test coverage