ENH: distinguish between face areaNormal/unitNormal in the code

...cations/utilities/mesh/conversion/gmshToFoam/gmshToFoam.C

...mesh/conversion/netgenNeutralToFoam/netgenNeutralToFoam.C

...h/conformalVoronoiMesh/conformalVoronoiMeshCalcDualMesh.C

...onoiMesh/conformalVoronoiMesh/conformalVoronoiMeshZones.C

...alVoronoiMesh/conformationSurfaces/conformationSurfaces.C

...s/utilities/mesh/manipulation/polyDualMesh/meshDualiser.C

...cations/utilities/surface/surfaceInflate/surfaceInflate.C

src/OpenFOAM/meshes/polyMesh/polyMesh.C

.../polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C

...esh/polyPatches/constraint/oldCyclic/oldCyclicPolyPatch.C

...hes/primitiveMesh/PrimitivePatch/PrimitivePatchMeshData.C

src/conversion/polyDualMesh/polyDualMesh.C

src/dynamicMesh/meshCut/cellCuts/cellCuts.C

...icMesh/motionSmoother/polyMeshGeometry/polyMeshGeometry.C

src/dynamicMesh/polyTopoChange/polyTopoChange/combineFaces.C

...namicMesh/polyTopoChange/polyTopoChange/hexRef8/hexRef8.C

...sh/slidingInterface/enrichedPatch/enrichedPatchCutFaces.C

src/fileFormats/stl/STLtriangleI.H

src/fileFormats/vtk/read/vtkUnstructuredReader.C

src/finiteArea/faMesh/faMeshDemandDrivenData.C