Merge branch 'barry/2023-06-07/optimize-multivecs-zhang' into 'main'

Optimize VecMDot_Seq as suggested by Junchao Zhang using BLAS 2 gemv

See merge request petsc/petsc!6580

Tests: tweak tests to make them less sensitive to the GEMV optimization

Merge remote-tracking branch 'origin/release'

Merge branch 'balay/ci-enable-arm' into 'release'

CI: enable ARM linux, mac builds

See merge request petsc/petsc!6956

CI: migrate osx-cxx-pkgs-opt to ARM

Add in Barry's configure pkgs in this job:
--download-amrex --download-cmake --download-ctetgen --download-exodusii --download-hdf5 --download-hypre --download-ks

CI: migrate osx-cxx-pkgs-opt to ARM

Add in Barry's configure pkgs in this job:
--download-amrex --download-cmake --download-ctetgen --download-exodusii --download-hdf5 --download-hypre --download-ks --download-metis --download-ml --download-mumps --download-netcdf --download-parmetis --download-pnetcdf --download-scalapack --download-suitesparse --download-triangle --download-zlib

However mumps gives 'make check' error - so disable for now:

> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range
Possible problem with ex19 running with mumps, diffs above

And fix compiler errors with Cxx/ML

CXX arch-ci-osx-cxx-pkgs-opt/obj/src/ksp/pc/impls/ml/ml.o
/Users/petsc/petsc/src/ksp/pc/impls/ml/ml.c:696:67: error: assigning to 'PetscErrorCode' from incompatible type 'int'
PetscStackCallExternalVoid("ML_Aggregate_Create", PetscCall(ML_Aggregate_Set_NullSpace(agg_object, bs, nvec + !!has_const, nullvec, mlocal)));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/petsc/petsc/include/petscerror.h:460:28: note: expanded from macro 'PetscCall'
ierr_petsc_call_q_ = __VA_ARGS__; \
^~~~~~~~~~~
/Users/petsc/petsc/include/petscerror.h:1738:7: note: expanded from macro 'PetscStackCallExternalVoid'
__VA_ARGS__; \
^~~~~~~~~~~

Update alt output files needed for M2

Co-authored-by: Barry Smith <bsmith@petsc.dev>

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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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