kfet -- Add fixme related to available checkouts in K-Psul

kfet/forms.py

@@ -273,6 +273,10 @@ class ArticleRestrictForm(ArticleForm):
 # -----
 
 class KPsulOperationGroupForm(forms.ModelForm):
+    # FIXME(AD): Use timezone.now instead of timezone.now() to avoid using a
+    # fixed datetime (application boot here).
+    # One may even use: Checkout.objects.is_valid() if changing
+    # to now = timezone.now is ok in 'is_valid' definition.
     checkout = forms.ModelChoiceField(
         queryset = Checkout.objects.filter(
             is_protected=False, valid_from__lte=timezone.now(),