Model support for multiple owners

Issue #719
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/migrations/0037_auto_20150810_1348.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('trans', '0036_auto_20150709_1005'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='project',
+            name='owners',
+            field=models.ManyToManyField(help_text='Owners of the project.', to=settings.AUTH_USER_MODEL, verbose_name='Owners', blank=True),
+        ),
+        migrations.AlterField(
+            model_name='project',
+            name='owner',
+            field=models.ForeignKey(related_name='old_owned_projects', blank=True, to=settings.AUTH_USER_MODEL, help_text='Owner of the project.', null=True, verbose_name='Owner'),
+        ),
+    ]

weblate/trans/models/project.py

@@ -136,11 +136,20 @@ class Project(models.Model, PercentMixin, URLMixin, PathMixin):
         verbose_name=ugettext_lazy('Owner'),
         null=True,
         db_index=True,
+        related_name='old_owned_projects',
         blank=True,
         help_text=ugettext_lazy(
             'Owner of the project.'
         )
     )
+    owners = models.ManyToManyField(
+        User,
+        verbose_name=ugettext_lazy('Owners'),
+        blank=True,
+        help_text=ugettext_lazy(
+            'Owners of the project.'
+        )
+    )
 
     objects = ProjectManager()