surfMesh reworked

- treat 'ofs' IO just like any other format
- dropped BasicMeshedSurface, since MeshedSurface can now also have zero or
  more zones
- UnsortedMeshedSurface is a special type of MeshedSurface with zero zones,
  but with additional zoneId labels
- use MeshedSurfaceProxy for writing surfaces with points/faces/zones and
  optional faceMap - provides output interface for MeshedSurface,
  UnsortedMeshedSurface and surfMesh.
- simplify output to filenames only, I can't see that the Ostream
  is needed anywhere
- surfMesh renaming now works, after the objectRegistry fix

src/sampling/cuttingPlane/cuttingPlane.H

@@ -62,10 +62,10 @@ class primitiveMesh;
 class cuttingPlane
 :
     public plane,
-    public BasicMeshedSurface<face>
+    public MeshedSurface<face>
 {
     //- Private typedefs for convenience
-        typedef BasicMeshedSurface<face> MeshStorage;
+        typedef MeshedSurface<face> MeshStorage;
 
     // Private data
 

src/sampling/sampledSurface/sampledPatch/sampledPatch.H

@@ -50,11 +50,11 @@ namespace Foam
 
 class sampledPatch
 :
-    public BasicMeshedSurface<face>,
+    public MeshedSurface<face>,
     public sampledSurface
 {
     //- Private typedefs for convenience
-        typedef BasicMeshedSurface<face> MeshStorage;
+        typedef MeshedSurface<face> MeshStorage;
 
     // Private data