Add 'revision' field to part

- e.g. different versions of a product
- Can keep old versions in database and mark as inactive

InvenTree/part/forms.py

@@ -93,6 +93,7 @@ class EditPartForm(HelperForm):
             'name',
             'IPN',
             'description',
+            'revision',
             'keywords',
             'variant_of',
             'is_template',