ENH: use restricted dictionary lookup for utilities (issue #762)

- get<label>, get<scalar> instead of readLabel, readScalar, etc.

src/paraview-plugins/vtkPVFoam/vtkPVFoamUpdateInfo.C

@@ -368,7 +368,7 @@ void Foam::vtkPVFoam::updateInfoPatches
                 const dictionary& patchDict = patchEntries[patchi].dict();
                 wordList groupNames;
 
-                sizes[patchi] = readLabel(patchDict.lookup("nFaces"));
+                sizes[patchi] = patchDict.get<label>("nFaces");
                 names[patchi] = patchEntries[patchi].keyword();
 
                 if