Removed ext_id_old, unfilled anyway

stages/migrations/0020_remove_old_ext_id.py

@@ -0,0 +1,19 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0019_add_old_ext_id'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='corpcontact',
+            name='ext_id_old',
+        ),
+        migrations.RemoveField(
+            model_name='corporation',
+            name='ext_id_old',
+        ),
+    ]