#146 Admins and update_all_parcels.py

* extends admin backend
    * adds found_in_codelists to KonovaCodeAdmin to see where a KonovaCode can be found in
    * improves rendering of after_states and before_states for all AbstractCompensationAdmins
    * adds geometry_id to all major datatype admin backends
    * adds st_area like calculation to geometry admin backend
* update_all_parcels
    * orders geometries by size (small to big) to process smaller geometries first and bigger later
    * adds more output to command for a better overview of what is just going on

konova/models/geometry.py

@@ -20,6 +20,9 @@ class Geometry(BaseResource):
     from konova.settings import DEFAULT_SRID
     geom = MultiPolygonField(null=True, blank=True, srid=DEFAULT_SRID)
 
+    def __str__(self):
+        return str(self.id)
+
     def save(self, *args, **kwargs):
         super().save(*args, **kwargs)
         self.check_for_conflicts()