Add a checksum field to the bom line item

InvenTree/part/migrations/0017_bomitem_checksum.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.4 on 2019-09-05 02:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0016_auto_20190820_0257'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='bomitem',
+            name='checksum',
+            field=models.CharField(blank=True, help_text='BOM line checksum', max_length=128),
+        ),
+    ]