流程引擎：load\save\submit;调整模型，以Bean方式处理

smtweb-framework/bpm/src/main/java/cc/smtweb/system/bpm/web/engine/model/flow/listcard/single/FlowTransHandler.java

@@ -57,5 +57,9 @@ public class FlowTransHandler<T extends DefaultEntity> extends AbstractDynPageHa
         return R.success(buildRetData());
     }
 
-    
+    public R retake() {
+        load();
+        flowInstance.retake();
+        return R.success(buildRetData());
+    }
 }