Gestion négatif d'un compte

- 3 paramètres ajustables : date jusqu'à, montant max, décalage de
  balance

kfet/forms.py

@@ -7,7 +7,7 @@ from django.contrib.admin.widgets import FilteredSelectMultiple
 from django.forms import modelformset_factory
 from django.utils import timezone
 from kfet.models import (Account, Checkout, Article, OperationGroup, Operation,
-    CheckoutStatement, ArticleCategory, Settings)
+    CheckoutStatement, ArticleCategory, Settings, AccountNegative)
 from gestioncof.models import CofProfile
 
 # -----
@@ -104,6 +104,15 @@ class GroupForm(forms.ModelForm):
         model  = Group
         fields = ['name', 'permissions']
 
+class AccountNegativeForm(forms.ModelForm):
+    class Meta:
+        model  = AccountNegative
+        fields = ['authz_overdraft_amount', 'authz_overdraft_until',
+                  'balance_offset', 'comment']
+        widgets = {
+            'authz_overdraft_until': DateTimeWidget(),
+        }
+
 # -----
 # Checkout forms
 # -----