CLI2: Prevent loops

- Context was sometimes causing looping:

    ::analyze -> ::addContexFilter -> ::addFilter -> ::analyze

  This is prevented by a simple latch.

src/CLI2.h

@@ -114,6 +114,7 @@ public:
 
   std::vector <std::pair <std::string, std::string>> _id_ranges;
   std::vector <std::string>                          _uuid_list;
+  bool                                               _context_filter_added;
 };
 
 #endif