ENH: add 'filtered' polyMesh regionName() method

- in various situations with mesh regions it is also useful to
  filter out or remove the defaultRegion name (ie, "region0").

  Can now do that conveniently from the polyMesh itself or as a static
  function. Simply use this

      const word& regionDir = polyMesh::regionName(regionName);

  OR  mesh.regionName()

  instead of

      const word& regionDir =
      (
           regionName != polyMesh::defaultRegion
         ? regionName
         : word::null
      );

  Additionally, since the string '/' join operator filters out empty
  strings, the following will work correctly:

      (polyMesh::regionName(regionName)/polyMesh::meshSubDir)

      (mesh.regionName()/polyMesh::meshSubDir)

src/functionObjects/utilities/vtkWrite/vtkWrite.C

@@ -280,10 +280,7 @@ bool Foam::functionObjects::vtkWrite::write()
     label regioni = 0;
     for (const word& regionName : meshes_.sortedToc())
     {
-        const word& regionDir =
-        (
-            regionName == polyMesh::defaultRegion ? word::null : regionName
-        );
+        const word& regionDir = polyMesh::regionName(regionName);
 
         auto& meshProxy = meshSubsets_[regioni];
         auto& vtuMeshCells = vtuMappings_[regioni];