优化雅可比矩阵计算；端口转发情况下仿真结果传输方式优化

tests/test_native_result_transport.py

@@ -104,7 +104,7 @@ class NativeResultTransportTests(unittest.TestCase):
             result = next(event['result'] for event in map(json.loads, body.splitlines()) if event['event']=='result')
             self.assertEqual(result['status'], status)
             self.assertTrue(result['partial'])
-            self.assertLess(result['simulatedUntil'], .1)
+            self.assertEqual(result['simulatedUntil'], 0.0)
             self.assertEqual(result['series']['time'][-1], result['simulatedUntil'])
             self.assertEqual(AsgiClient(app).get('/api/system-xml/simulations/'+task.simulation_id).json()['result'], result)