Bug Fix - #260

- Fixed bug whereby the start, stop and delete commands were not
  complaining when filter arguments were specified, even though they
  were ignored.  Thanks to Charles T. Yun.

src/Context.h

@@ -65,6 +65,7 @@ public:
   void clear ();
 
   std::string canonicalize (const std::string&) const;
+  void disallowModification () const;
 
 private:
   void loadCorrectConfigFile ();