Added faceCentres().

...FOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.C

...FOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.H

...s/primitiveMesh/PrimitivePatch/PrimitivePatchAddressing.C

...s/primitiveMesh/PrimitivePatch/PrimitivePatchBdryPoints.C

...meshes/primitiveMesh/PrimitivePatch/PrimitivePatchCheck.C

...meshes/primitiveMesh/PrimitivePatch/PrimitivePatchClear.C

...es/primitiveMesh/PrimitivePatch/PrimitivePatchEdgeLoops.C

...mitiveMesh/PrimitivePatch/PrimitivePatchLocalPointOrder.C

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

...es/primitiveMesh/PrimitivePatch/PrimitivePatchMeshEdges.C

...mitiveMesh/PrimitivePatch/PrimitivePatchPointAddressing.C

...rimitiveMesh/PrimitivePatch/PrimitivePatchProjectPoints.C