#300 Extend mail templates

* extends all relevant mail templates such that municipals of an entry will be shown in the mail

konova/models/geometry.py

@@ -276,6 +276,22 @@ class Geometry(BaseResource):
 
         return parcels
 
+    def get_underlying_municipals(self, parcels=None):
+        """ Getter for related municipals
+
+        If no QuerySet of parcels is provided, the parcels will be fetched
+
+        Returns:
+            municipals (QuerySet): The related municipals as queryset
+        """
+        from konova.models import Municipal
+
+        if parcels is None:
+            parcels = self.get_underlying_parcels()
+        municipals = parcels.order_by("municipal").distinct("municipal").values("municipal__id")
+        municipals = Municipal.objects.filter(id__in=municipals).order_by("name")
+        return municipals
+
     def count_underlying_parcels(self):
         """ Getter for number of underlying parcels