ENH: allow CFoods to provide update_flags

Summary

Allow CFoods to provide flags for the update of entities. This is useful if the crawler shall create entities that have missing obligatory properties.

Test Environment

Have a CFood create an entity with missing obligatory properties. See GEOMAR

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src/caosadvancedtools/cfood.py

@@ -170,6 +170,7 @@ class AbstractCFood(object, metaclass=ABCMeta):
         self.identifiables = db.Container()
         self.item = item
         self.attached_items = []
+        self.update_flags = {}
 
     @abstractmethod
     def create_identifiables(self):