F h5 cfood

https://gitlab.com/caosdb/caosdb-advanced-user-tools/-/merge_requests/78

integrationtests/example_hdf5cfood.py

@@ -48,12 +48,7 @@ class ExampleH5CFood(H5CFood):
         self.identifiables.append(self.identifiable_root)
 
     def special_treatment(self, key, value, dtype):
-        if key == "ship_imo":
-            ship = db.Record()
-            ship.add_parent("Ship")
-            ship.add_property("IMO Number", value)
-            self.identifiables.append(ship)
-
-            return "Ship", ship, "Ship"
+        if key == "attr_data_root":
+            return "single_attribute", value, dtype
 
         return key, value, dtype