Move new version creation blocking from the documents app to the checkouts app.

Closes GitLab #294.

mayan/apps/checkouts/migrations/0006_newversionblock.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.11 on 2016-12-22 05:34
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('documents', '0036_auto_20161222_0534'),
+        ('checkouts', '0005_auto_20160122_0756'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='NewVersionBlock',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('document', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='documents.Document', verbose_name='Document')),
+            ],
+            options={
+                'verbose_name': 'New version block',
+                'verbose_name_plural': 'New version blocks',
+            },
+        ),
+    ]