ENH: improved sample surfaces and surface writers (#1206)

- The writers have changed from being a generic state-less set of
  routines to more properly conforming to the normal notion of a writer.
  These changes allow us to combine output fields (eg, in a single
  VTK/vtp file for each timestep).

  Parallel data reduction and any associated bookkeeping is now part
  of the surface writers.
  This improves their re-usability and avoids unnecessary
  and premature data reduction at the sampling stage.

  It is now possible to have different output formats on a per-surface
  basis.

- A new feature of the surface sampling is the ability to "store" the
  sampled surfaces and fields onto a registry for reuse by other
  function objects.

  Additionally, the "store" can be triggered at the execution phase
  as well

applications/utilities/mesh/manipulation/checkMesh/checkMeshQuality.C

@@ -10,7 +10,7 @@ Foam::label Foam::checkMeshQuality
 (
     const polyMesh& mesh,
     const dictionary& dict,
-    const autoPtr<surfaceWriter>& writer
+    autoPtr<surfaceWriter>& writer
 )
 {
     label noFailedChecks = 0;
@@ -29,9 +29,10 @@ Foam::label Foam::checkMeshQuality
                 << " faces in error to set " << faces.name() << endl;
             faces.instance() = mesh.pointsInstance();
             faces.write();
+
             if (writer.valid())
             {
-                mergeAndWrite(writer(), faces);
+                mergeAndWrite(*writer, faces);
             }
         }
     }