[openstreetmap/openstreetmap-website] add bulk_upload (#1995)

[mmd]

I have found another bug:

```
<?xml version="1.0" encoding="UTF-8"?>
<osmChange version="0.6" generator="iD">
  <create>
    <node id="-1" lat="1" lon="2" changeset="1248"/>
    </create>
   <create>
    <node id="-1" lat="1" lon="2" changeset="1248"/>
    </create>
</osmChange>
```

Expected Result:

HTTP 400: Placeholder IDs must be unique for created elements.


Actual Result:

HTTP 200 OK

```
<?xml version="1.0" encoding="UTF-8"?>
<diffResult version="0.6" generator="OpenStreetMap server" copyright="OpenStreetMap and contributors" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/">
    <node old_id="-1" new_id="5003081839" new_version="1"/>
    <node old_id="-1" new_id="5003081840" new_version="1"/>
</diffResult>
```


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