STYLE: can add compile-time deprecated message for autoPtr::set()

- deprecated Feb-2018, but not marked as such.

  The set() method originally enforce an additional run-time check
  (Fatal if pointer was already set), but this was rarely used.
  In fact, the set() method was invariably used in constructors
  where the pointer by definition was unset.

  Can now mark as deprecated to catch the last of these.
  We prefer reset() for similarity with std::unique_ptr

  Eg,
  FOAM_EXTRA_CXXFLAGS="-DFoam_autoPtr_deprecate_setMethod"  wmake

src/functionObjects/field/columnAverage/columnAverage.C

@@ -88,9 +88,9 @@ Foam::functionObjects::columnAverage::meshAddressing(const polyMesh& mesh) const
             mesh.points()
         );
 
-        globalFaces_.set(new globalIndex(uip.size()));
-        globalEdges_.set(new globalIndex(uip.nEdges()));
-        globalPoints_.set(new globalIndex(uip.nPoints()));
+        globalFaces_.reset(new globalIndex(uip.size()));
+        globalEdges_.reset(new globalIndex(uip.nEdges()));
+        globalPoints_.reset(new globalIndex(uip.nPoints()));
         meshStructurePtr_.reset
         (
             new meshStructure

src/functionObjects/field/surfaceDistance/surfaceDistance.C

@@ -85,8 +85,8 @@ bool Foam::functionObjects::surfaceDistance::read
 
     doCells_ = dict.getOrDefault("calculateCells", true);
 
-    geomPtr_.clear();
-    geomPtr_.set
+    geomPtr_.reset(nullptr);
+    geomPtr_.reset
     (
         new searchableSurfaces
         (