diff transmission code tested!!!

luprex/core/cpp/animqueue.hpp

@@ -181,6 +181,9 @@ public:
     // Mutator to create a new step.
     void add(int64_t id, const AnimStep &step);
     
+    // Clear and set the plane.
+    void clear(const std::string &plane);
+    
     // Serialize or deserialize to a StreamBuffer
     //
     // Caution: version numbers are not stored.  On deserialize,