Bug #956

- Prevent any verbose information to be printed with the 'ids', 'uuids' and
  helper subcommands.
- Unit tests.
- Precise this behavior in the man pages.

src/Context.h

@@ -79,6 +79,7 @@ private:
   void createDefaultConfig ();
   void loadAliases ();
   void updateXtermTitle ();
+  void updateVerbosity ();
 
 public:
   std::string                         program;