- with alternative faceCell addressing, use the three-parameter
version only. This avoids potential future ambiguity with the
two-parameter version (eg, with a label type)
ENH: add faPatchField patchInternalField() for symmetry with fvPatchField
ENH: direct reference to mesh thisDb instead of inferring
ENH: pointMesh::boundaryMesh() method (eg, similar to fvMesh)