DOC: elaborate the usage of function objects

ENH: update libs of etc/caseDicts/postProcess items
  ENH: ensure destructor=default
  ENH: ensure constness
  ENH: ensure no 'copy construct' and 'no copy assignment' exist
  TUT: add examples of function objects with full set
       of settings into a TUT if unavailable
  TUT: update pisoFoam/RAS/cavity tutorial in terms of usage

src/functionObjects/field/interfaceHeight/interfaceHeight.C

@@ -230,11 +230,11 @@ Foam::functionObjects::interfaceHeight::interfaceHeight
 :
     fvMeshFunctionObject(name, runTime, dict),
     logFiles(obr_, name),
-    alphaName_("alpha"),
     liquid_(true),
-    locations_(),
+    alphaName_("alpha"),
     interpolationScheme_("cellPoint"),
-    direction_(vector::zero)
+    direction_(vector::zero),
+    locations_()
 {
     read(dict);
     resetNames({"height", "position"});
@@ -244,12 +244,6 @@ Foam::functionObjects::interfaceHeight::interfaceHeight
 }
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-Foam::functionObjects::interfaceHeight::~interfaceHeight()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 bool Foam::functionObjects::interfaceHeight::read(const dictionary& dict)