Created|Deleted refactoring

* refactors base attributes created and deleted into UserActionLogEntry foreign keys
* refactors all related queries and process logic
* fixes binding_on into binding_date in intervention/detail/view.html
* adds basic __str__ for some models
*

compensation/views.py

@@ -28,7 +28,7 @@ def index_view(request: HttpRequest):
     template = "generic_index.html"
     user = request.user
     compensations = Compensation.objects.filter(
-        deleted_on=None,
+        deleted=None,
     )
     table = CompensationTable(
         request=request,
@@ -92,7 +92,7 @@ def account_index_view(request: HttpRequest):
     template = "generic_index.html"
     user = request.user
     eco_accounts = EcoAccount.objects.filter(
-        deleted_on=None,
+        deleted=None,
     )
     table = EcoAccountTable(
         request=request,