Merge branch 'jolivet/clang-format-18' into 'main'

clang-format version 18

See merge request petsc/petsc!6902

Remove trailing whitespace

Merge branch 'adams/gamg-square-graph-true' into 'main'

GAMG: switch the default to using square graph

See merge request petsc/petsc!6923

GAMG: switch the default to using square graph

Merge branch 'jed/amg-symmetry' into 'main'

PCGAMG: skip symmetric non-SPD use of KSPCR for eigenvalues

See merge request petsc/petsc!4910

PCGAMG: update tests

* formatting of Chebyshev information
* use of GAMG SA eigenvalue estimates

Merge branch 'adams/snes-ex56-update' into 'main'

Add PCMGGetGridComplexity()

See merge request petsc/petsc!4552

added setting KSPCR for eigen estimates in GAMG for symmetric and hermetian matrices

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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