It was only looking for faces that were used in both
endpoints but not actually checking whether they were indeed
an edge (== consecutive vertex) in all faces. So if one
face had an additional crossing edge and another didn't it
would find more edgeFaces than the proper
'primitiveMesh::edgeFaces()' routine.
This occasionally happened inside snappyHexMesh
(e.g. motorBike tutorial)
c9c85d9afe