change to dm.dir_l1 by default

csst_common/data_manager.py

@@ -191,6 +191,9 @@ class CsstMsDataManager:
         # aXe
         self.set_env()
 
+        # change to working directory
+        os.chdir(self.dir_l1)
+
     def set_env(self):
         """ set environment variables """
         if os.uname()[1] == "dandelion":