[Compensation] Conservation office #5

* keeps responsible data in compensation model for potential future purposes
* refactors registration_office and conservation_office to map onto KonovaCodes instead of own Organization model
* adds str_as_office property-method to KonovaCode to provide an easy way of rendering template data
* adds missing highlighting in case of missing information about registration office and conservation office

codelist/models.py

@@ -57,6 +57,13 @@ class KonovaCode(models.Model):
             ret_val += " ({})".format(self.short_name)
         return ret_val
 
+    @property
+    def str_as_office(self):
+        ret_val = self.long_name
+        if self.parent:
+            ret_val += ", " + self.parent.long_name
+        return ret_val
+
 
 class KonovaCodeList(models.Model):
     """