turn Source.name into a CharField to allow periods

src/c3nav/mapdata/migrations/0051_auto_20171125_1241.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.6 on 2017-11-25 12:41
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0050_remove_geometry_bounds'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='source',
+            name='name',
+            field=models.CharField(max_length=50, unique=True, verbose_name='Name'),
+        ),
+    ]

src/c3nav/mapdata/models/source.py

@@ -12,7 +12,7 @@ class Source(BoundsMixin, AccessRestrictionMixin, models.Model):
     """
     A map source, images of levels that can be useful as backgrounds for the map editor
     """
-    name = models.SlugField(_('Name'), unique=True, max_length=50)
+    name = models.CharField(_('Name'), unique=True, max_length=50)  # a slugfield would forbid periods
 
     class Meta:
         verbose_name = _('Source')