STYLE: more consistent formatting for deprecated items

- Start brief descriptions with 'Deprecated(YYYY-MM)' so that it is
  readily visible in the short method description. Consistent date
  format (YYYY-MM), placed immediately after the \deprecated tag.

src/meshTools/sets/topoSetSource/topoSetSource.H

@@ -89,7 +89,7 @@ public:
             NEW,                //!< Create a new set and ADD elemets to it
             REMOVE,             //!< Remove the set (from the file system)
             LIST,               //!< Print contents of the set
-            DELETE = SUBTRACT,  //!< \deprecated alias for SUBTRACT (OCT-2018)
+            DELETE = SUBTRACT,  //!< \deprecated(2018-10) Alias for SUBTRACT
         };
 
         //- The setActions text representations
@@ -175,8 +175,8 @@ public:
 
     // Static Functions
 
-        //- Convert string to action
-        //  \deprecated use direct access to actionNames (JUL-2018)
+        //- Deprecated(2018-07) convert string to action
+        //  \deprecated(2018-07) - use actionNames[] directly
         static setAction toAction(const word& actionName)
         {
             return actionNames[actionName];

src/meshTools/sets/topoSets/topoSet.H

@@ -341,10 +341,6 @@ public:
         //- Subtract elements present in set.
         virtual void subtractSet(const topoSet& set);
 
-        //- Subtract elements present in set.
-        //  \deprecated use subtractSet instead (OCT-2018)
-        virtual void deleteSet(const topoSet& set);
-
         //- Sync set across coupled patches.
         virtual void sync(const polyMesh& mesh);
 
@@ -390,11 +386,17 @@ public:
         static void removeFiles(const polyMesh&);
 
 
-    // Member operators
+    // Member Operators
 
         //- Copy labelHashSet part only
         void operator=(const topoSet&);
 
+
+    // Housekeeping
+
+        //- Deprecated(2018-10) subtract elements present in set.
+        //  \deprecated(2018-10) - use subtractSet instead
+        virtual void deleteSet(const topoSet& set);
 };