STYLE: add nBoundaryFaces() method to primitiveMesh

- nBoundaryFaces() is often used and is identical to
  (nFaces() - nInternalFaces()).

- forward the mesh nInternalFaces() and nBoundaryFaces() to
  polyBoundaryMesh as nFaces() and start() respectively,
  for use when operating on a polyBoundaryMesh.

STYLE:

- use identity() function with starting offset when creating boundary maps.

     labelList map
     (
         identity(mesh.nBoundaryFaces(), mesh.nInternalFaces())
     );

  vs.

     labelList map(mesh.nBoundaryFaces());
     forAll(map, i)
     {
         map[i] = mesh.nInternalFaces() + i;
     }

applications/test/globalMeshData/Test-globalMeshData.C

@@ -180,7 +180,7 @@ int main(int argc, char *argv[])
         const labelListList& transformedSlaves =
             globalData.globalPointTransformedBoundaryFaces();
 
-        label nBnd = mesh.nFaces()-mesh.nInternalFaces();
+        const label nBnd = mesh.nBoundaryFaces();
 
         pointField fc(globalPointBoundaryFacesMap.constructSize());
         SubList<point>(fc, nBnd) =