Add nice whole file support

accounting/migrations/0017_auto_20160810_0547.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounting', '0016_auto_20160807_2000'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operation',
+            name='invoice',
+            field=models.ForeignKey(blank=True, related_name='operations', to='core.SithFile', null=True, verbose_name='invoice'),
+        ),
+    ]