Implement strongly enforced (internal) Dirichlet constraints for cell-centered models
This is a follow up of #743 (closed). The cell-centered implementation of internal Dirichlet contrainst was incorrectly introduced with !1664 (merged). The wrong implementation is removed in !1725 (merged) and replaced by an error. Hence, this is a reminder that a correct implementation is still missing.
This is a feature request:
- Implement strongly enforced Dirichlet constraints for any user-chosen cell, using the interface implemented in !1664 (merged).