use usr1 to trigger refresh (?)

nwg_panel/main.py

@@ -117,13 +117,14 @@ def check_tree():
 
 
 def check_dwl_data(*args):
+    print("SIGUSR1")
     global dwl_timestamp
     timestamp = datetime.now()
     diff = (timestamp - dwl_timestamp).total_seconds() * 1000
     if diff > 50:
         common.dwl_data = load_json(common.dwl_data_file)
         if common.dwl_data:
-            print(common.dwl_data, diff)
+            print(diff)
             for item in common.dwl_instances:
                 item.refresh(common.dwl_data)
         dwl_timestamp = datetime.now()