A few assorted cleanups.

luprex/core/cpp/world.hpp

@@ -199,19 +199,20 @@ public:
     void snapshot();
     void rollback();
 
-private:
     // Run any threads which according to the scheduler queue are ready.
     //
     void run_scheduled_threads(int64_t clk);
 
-    // Store a pointer to a world model into a lua registry.
-    //
-    static void store_global_pointer(lua_State *L, World *w);
-
     // Check that the main thread has nothing on the stack
     //
     bool stack_is_clear() const { return lua_gettop(state()) == 0; }
 
+private:
+
+    // Store a pointer to a world model into a lua registry.
+    //
+    static void store_global_pointer(lua_State *L, World *w);
+
     // Invoke a plan.
     //
     void invoke_plan(int64_t actor_id, int64_t place_id, const std::string &action, const InvocationData &idata);