Add parent relationship between thing and features

ml/fml40/features/functionalities/accepts_felling_jobs.py

 """This module implements the class AcceptsFellingJobs."""
 
-from ml.fml40.features.properties.values.documents.jobs.felling_job import \
-    FellingJob
+from ml.fml40.features.properties.values.documents.jobs.felling_job import FellingJob
 from ml.ml40.features.functionalities.accepts_jobs import AcceptsJobs
-from ml.ml40.features.properties.values.documents.jobs.job_status import \
-    JobStatus
+from ml.ml40.features.properties.values.documents.jobs.job_status import JobStatus
 
 
 class AcceptsFellingJobs(AcceptsJobs):
     """This functionality signalizes that FellingJobs can be processed and
     offers the possibility to remove and query it."""
 
-    def __init__(self, namespace="fml40", name="", identifier=""):
+    def __init__(self, namespace="fml40", name="", identifier="", parent=None):
         """Initializes the object.
 
         :param name: Object name
         :param identifier: Identifier
 
         """
-        super().__init__(namespace=namespace, name=name, identifier=identifier)
+        super().__init__(
+            namespace=namespace, name=name, identifier=identifier, parent=parent
+        )
 
     def acceptJob(self, job: FellingJob) -> bool:
         """Accepts the given FellingJob job. Returns true if the job has been