#249 Created as modified

* fills modified attribute on new entries with created value automatically
* adds default ordering by last modified on table overviews

compensation/forms/eco_account.py

@@ -117,6 +117,7 @@ class NewEcoAccountForm(AbstractCompensationForm, CompensationResponsibleFormMix
                 responsible=responsible,
                 deductable_surface=surface,
                 created=action,
+                modified=action,
                 comment=comment,
                 is_pik=is_pik,
                 legal=legal