Plex: Update examples to use new creation interface

Merge branch 'knepley/feature-ds-residualbd-key' into 'main'

DS+FE+Doc: Make BdResidual take a key

See merge request petsc/petsc!3761

DM+Plex: Boundary integration functions are now stored in a PetscWeakForm held in the Boundary object
- Boundary residual/Jacobian functions now take a form key
- Now store DMLabel in DSBoundary
- Im

DM+Plex: Boundary integration functions are now stored in a PetscWeakForm held in the Boundary object
- Boundary residual/Jacobian functions now take a form key
- Now store DMLabel in DSBoundary
- Improved Boundary, Weak Form, and DS viewers
- Remove DMCopyBoundary(), DMCopyDisc() is sufficient
- Need DMTransferDS_Internal() to create new DS with label in the correct DM
- Correct all DMAddBoundary() in tests
- Allow DMBoundary to hold just a label name if necessary since p4est is missing labels in a lot of places
- Fix propagating coordinate dimension in DS

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Merge branch 'knepley/feature-tetgen-labels' into 'master'

DM: Added universal label

See merge request petsc/petsc!3402

DM: Added universal label - A universal label encodes the markers for a set of labels - We need this when using systems like TetGen that only take a single label - Added tests in Plex ex11

Merge branch 'knepley/feature-plex-stokes-tutorial' into 'master'

Knepley/feature plex stokes tutorial

See merge request petsc/petsc!3038

DM: Nullspace constructor should report old and new field numbers

Merge branch 'rlwalker/feature-plex-example-poroelasticity-cryer' into 'master'

Rlwalker/feature plex example poroelasticity cryer

See merge request petsc/petsc!3013

Plex: Need to add BC for the solution time derivative in TS problems
- Added DMPlexInsertTimeDerivativeBoundaryValues()
- Added time derivative of the solution argument to DMAddBoundary(),
DMGetBou

Plex: Need to add BC for the solution time derivative in TS problems
- Added DMPlexInsertTimeDerivativeBoundaryValues()
- Added time derivative of the solution argument to DMAddBoundary(),
DMGetBoundary(), PetscDSAddBoundary(), PetscDSUpdateBoundary(),
PetscDSGetBoundary()

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Merge branch 'knepley/feature-dm-exact-solution' into 'master'

Knepley/feature dm exact solution

See merge request petsc/petsc!2940

DM+SNES: Update examples for DS functions

Merge branch 'knepley/feature-dm-addboundary-collective' into 'master'

Knepley/feature dm addboundary collective

See merge request petsc/petsc!2659

DM: Change examples to use DMAddBoundary() instead of PetscDSAddBoundary()
- Now you have to call DMCopyDS() after labels have been established on the coarse DM
- Also, p4est setup has to have happen

DM: Change examples to use DMAddBoundary() instead of PetscDSAddBoundary()
- Now you have to call DMCopyDS() after labels have been established on the coarse DM
- Also, p4est setup has to have happened before label completion

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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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