GeometricField: Temporary fields are no longer registered on the database by default

Registration occurs when the temporary field is transferred to a non-temporary
field via a constructor or if explicitly transferred to the database via the
regIOobject "store" methods.

applications/utilities/mesh/advanced/refinementLevel/refinementLevel.C

@@ -279,7 +279,7 @@ int main(int argc, char *argv[])
             IOobject::NO_WRITE
         ),
         fMesh,
-        dimensionedScalar("zero", dimless/dimTime, 0)
+        dimensionedScalar(dimless/dimTime, 0)
     );
 
     // Set cell values