Provide download link for part attachments

- Better upload management for attachment files (separated based on part ID)

InvenTree/part/templates/part/part_base.html

@@ -66,7 +66,7 @@
     <h4>Attachments</h4>
     <ul>
     {% for attachment in part.attachments.all %}
-    <li><a href="{{ attachment.attachment }}">{{ attachment.attachment }}</a></li>
+    <li><a href="/media/{{ attachment.attachment }}">{{ attachment.basename }}</a></li>
     {% endfor %}
     </ul>
 </div>