ENH: new triFace methods to match those in face. FaceType typedef for surface meshes

src/OpenFOAM/meshes/meshShapes/face/face.C

src/OpenFOAM/meshes/meshShapes/face/face.H

src/OpenFOAM/meshes/meshShapes/face/faceI.H

src/OpenFOAM/meshes/meshShapes/face/faceIntersection.C

src/OpenFOAM/meshes/meshShapes/face/faceTemplates.C

src/OpenFOAM/meshes/meshShapes/face/oppositeFace.H

src/OpenFOAM/meshes/meshShapes/triFace/triFace.H

src/OpenFOAM/meshes/meshShapes/triFace/triFaceI.H

src/OpenFOAM/meshes/meshShapes/triFace/triFaceTemplates.C

src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H

src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H

src/surfMesh/MeshedSurface/MeshedSurface.C

src/surfMesh/MeshedSurface/MeshedSurface.H

src/surfMesh/MeshedSurface/MeshedSurfaceCore.C

src/surfMesh/MeshedSurface/MeshedSurfaceIO.C

src/surfMesh/MeshedSurface/MeshedSurfaceNew.C

src/surfMesh/MeshedSurface/MeshedSurfaceZones.C

src/surfMesh/MeshedSurface/MeshedSurfaces.C

src/surfMesh/MeshedSurface/MeshedSurfaces.H

src/surfMesh/MeshedSurface/MeshedSurfacesFwd.H