- renamed surface regions (formerly patches or groups) to surfZone.
- added surfMesh, but without any of the patch information needed to make it
useful for finiteArea.
- promoted coordinateSystem transformation to surfaceMeshConvert and moved
old to surfaceMeshConvertTesting.
- ditched PrimitivePatchExtra in favour of a PatchTools class that is
currently just a collection of static functions. They could equally well
live within PrimitivePatch itself, but isolated also has its advantages.
- MeshedSurface, UnsortedMeshedSurface now have 'regions' instead of
'patches' since they are more like a faceZone for meshed surfaces than
patches. This might avoid confusion at a later stage.
