ENH: blockMesh: generate duplicate boundary faces. Fixes #1516

src/OpenFOAM/meshes/polyMesh/polyMeshFromShapeMesh.C

.../incompressible/pimpleFoam/RAS/oscillatingInletACMI2D/0/U

...pressible/pimpleFoam/RAS/oscillatingInletACMI2D/0/epsilon

.../incompressible/pimpleFoam/RAS/oscillatingInletACMI2D/0/k

...ncompressible/pimpleFoam/RAS/oscillatingInletACMI2D/0/nut

.../incompressible/pimpleFoam/RAS/oscillatingInletACMI2D/0/p

...mpressible/pimpleFoam/RAS/oscillatingInletACMI2D/Allclean

...compressible/pimpleFoam/RAS/oscillatingInletACMI2D/Allrun

...ble/pimpleFoam/RAS/oscillatingInletACMI2D/Allrun-parallel

...ressible/pimpleFoam/RAS/oscillatingInletACMI2D/Allrun.pre

...compressible/pimpleFoam/RAS/oscillatingInletACMI2D/README

...impleFoam/RAS/oscillatingInletACMI2D/system/blockMeshDict