Compensation users refactoring

* moves accessibility of compensations completely into related intervention.users set
  * this way the visibility for a compensation can not differ from the one of the 'parent' intervention

compensation/filters.py

@@ -18,6 +18,24 @@ class CompensationTableFilter(InterventionTableFilter):
 
     """
 
+    def _filter_show_all(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of 'show_all' setting
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        if not value:
+            return queryset.filter(
+                intervention__users__in=[self.user],  # requesting user has access
+            )
+        else:
+            return queryset
+
     def _filter_show_recorded(self, queryset, name, value) -> QuerySet:
         """ Filters queryset depending on value of 'show_recorded' setting