SETERRQ[1-9]+ begone

Merge branch 'knepley/feature-dm-aux-data-keys' into 'main'

Plex: Updates to declarative interface for FEM problems

See merge request petsc/petsc!3972

DT: Changed key and WeakForm internals
- Changed name to PetscFormKey
- Added part member
- Now maps are referred to by PetscWeakFormKind
- Added PetscWeakFormClearIndex() and PetscWeakFormClear()

DT: Changed key and WeakForm internals
- Changed name to PetscFormKey
- Added part member
- Now maps are referred to by PetscWeakFormKind
- Added PetscWeakFormClearIndex() and PetscWeakFormClear()
- Passing NULL to SetIndex is now ignored
- Added tests

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