ENH: improvements for makeFaMesh, checkFaMesh

- added -dry-run, -write-vtk options.
  Additional mesh information after creation.

- add parallel reductions and more information for checkFaMesh

ENH: minor cleanup of faPatch internals

- align pointLabels and pointEdges creation more closely with coding
  patterns used in PrimitivePatch

- use fileHandler when loading "S0" field.

src/finiteArea/faMesh/faPatches/constraint/processor/processorFaPatch.C

@@ -80,12 +80,7 @@ void Foam::processorFaPatch::makeNonGlobalPatchPoints() const
      || !boundaryMesh().mesh()().globalData().nGlobalPoints()
     )
     {
-        nonGlobalPatchPointsPtr_ = new labelList(nPoints());
-        labelList& ngpp = *nonGlobalPatchPointsPtr_;
-        forAll(ngpp, i)
-        {
-            ngpp[i] = i;
-        }
+        nonGlobalPatchPointsPtr_ = new labelList(identity(nPoints()));
     }
     else
     {