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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Merge branch 'stefanozampini/feature-add-hpackages-rebased' into 'master'

Fixes to MatProduct + many bug fixes + new hierarchical matrix support

See merge request petsc/petsc!2800

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeInterm

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeIntermediateStructures in favor of MatProductClear
Clean up base headers for matrix classes
Update tests (remove some todos from ex70 because now the tests work properly)
MatProductSetType should not set the setfromoptions operation!
MatProductClear should reset operations
Remove no longer needed function composition
Add few more PetscInfo messages
Single dispatch routine
MatProductSetFromOptions routines are now allowed to fail
MatProductSetFromOptions_SeqXBAIJ_SeqDense: support for MATPRODUCT_AtB
MatTransposeMatMultNumeric_SeqAIJ_SeqDense: fix bug with leading dimensions
Make internal functions PETSC_INTERN
Fix a couple of places where the destroy routine of the matrix was changed
Products should all use internal data (or composed data attached to the internal data)
Fix few bugs in MPIAIJ_MPIDENSE product with stages

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Merge branch 'jed/promote-examples-tests-tutorials' [petsc/petsc!2610]

* jed/promote-examples-tests-tutorials:
Promote examples/{tests,tutorials}/ to {tests,tutorials}/

Promote examples/{tests,tutorials}/ to {tests,tutorials}/

This shortens paths and improves consistency between test target names
and paths to the source and output files. Most of the work was
compl

Promote examples/{tests,tutorials}/ to {tests,tutorials}/

This shortens paths and improves consistency between test target names
and paths to the source and output files. Most of the work was
completed by this script, followed by mild cleanup of nonconforming
cases.

for makefile in `git ls-files 'src/*makefile'`; do
if rg -q 'DIRS.*\bexamples\b' $makefile; then
base=$(dirname $makefile)
dirs=$(cd $base/examples && ls -d tests tutorials 2>/dev/null | xargs echo)
perl -pi -e "s#^(DIRS.*)\bexamples\b#\1${dirs}#" $makefile
git rm $base/examples/makefile
for t in $dirs; do
git mv $base/examples/$t $base/
perl -pi -e "s#^(LOCDIR[[:space:]]*=).*#\1 $base/$t/#" $base/$t
done
fi
done

git grep -l -E -z 'examples/(tutorials|tests)' | xargs -0 perl -pi -e 's#examples/(tutorials|tests)#\1#g'
git checkout @ \
src/docs/website/documentation/changes/ \
src/benchmarks/results/

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