#249 Created as modified

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

ema/views/ema.py

@@ -39,6 +39,8 @@ def index_view(request: HttpRequest):
     template = "generic_index.html"
     emas = Ema.objects.filter(
         deleted=None,
+    ).order_by(
+        "-modified__timestamp"
     )
 
     table = EmaTable(