validate year in logbook entry form

core/models/troggle.py

@@ -73,17 +73,6 @@ class Expedition(TroggleModel):
     def get_absolute_url(self):
         return urljoin(settings.URL_ROOT, reverse("expedition", args=[self.year]))
 
-
-# class ExpeditionDay(TroggleModel):
-# """Exists only on Expedition now. Removed links from logbookentry, personlogentry, survex stuff etc.
-# """
-# expedition  = models.ForeignKey("Expedition",on_delete=models.CASCADE)
-# date        = models.DateField()
-
-# class Meta:
-# ordering = ('date',)
-
-
 class Person(TroggleModel):
     """single Person, can go on many years"""