Add 'active' field to Part model

InvenTree/part/migrations/0012_part_active.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2 on 2019-04-28 13:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0011_auto_20190428_0841'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='part',
+            name='active',
+            field=models.BooleanField(default=True, help_text='Is this part active?'),
+        ),
+    ]