ENH: avoid readScalar, readLabel etc from dictionary (#762, #1033)

- use the dictionary 'get' methods instead of readScalar for
  additional checking

     Unchecked:  readScalar(dict.lookup("key"));
     Checked:    dict.get<scalar>("key");

- In templated classes that also inherit from a dictionary, an additional
  'template' keyword will be required. Eg,

     this->coeffsDict().template get<scalar>("key");

  For this common use case, the predefined getXXX shortcuts may be
  useful. Eg,

     this->coeffsDict().getScalar("key");

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/conformalVoronoiMeshCalcDualMesh.C

@@ -751,7 +751,7 @@ Foam::conformalVoronoiMesh::createPolyMeshFromPoints
 
     forAll(patches, p)
     {
-        label totalPatchSize = patchDicts[p].get<label>("nFaces");
+        const label totalPatchSize = patchDicts[p].get<label>("nFaces");
 
         if
         (

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/conformalVoronoiMeshIO.C

@@ -816,7 +816,7 @@ void Foam::conformalVoronoiMesh::writeMesh
 
     forAll(patches, p)
     {
-        label totalPatchSize = patchDicts[p].get<label>("nFaces");
+        const label totalPatchSize = patchDicts[p].get<label>("nFaces");
 
         if
         (