cellMatcher - can use ListOps for identity instead of its own method

src/OpenFOAM/meshes/meshShapes/cellMatcher/cellMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/cellMatcher.H

...penFOAM/meshes/meshShapes/cellMatcher/degenerateMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/hexMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/prismMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/pyrMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/tetMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/tetWedgeMatcher.C

src/OpenFOAM/meshes/meshShapes/cellMatcher/wedgeMatcher.C