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/initialisation/hydrostaticPressure/hydrostaticPressure.C

@@ -87,9 +87,9 @@ void Foam::functionObjects::hydrostaticPressure::calculateAndWrite()
     auto& p = thermo.p();
 
     Info<< "Performing hydrostatic pressure initialisation";
-    if (mesh_.name() != polyMesh::defaultRegion)
+    if (!mesh_.regionName().empty())
     {
-        Info<< "for region " << mesh_.name();
+        Info<< " region=" << mesh_.name();
     }