PIThreadNotifier, rewrite PIObject::deleteLater()

tests for PIThreadNotifier and PIObject::deleteLater()

libs/main/core/piobject.h

@@ -503,10 +503,7 @@ private:
 		static Deleter * instance();
 		void post(PIObject * o);
 	private:
-		void proc();
-		void deleteAll();
 		void deleteObject(PIObject * o);
-		std::atomic_bool stopping, started, posted;
 		PRIVATE_DECLARATION(PIP_EXPORT)
 	};