dataset_curator on all surveys

This sets the `:dataset_curator` attribute on all surveys, which tells us which field should be used to find the publisher.

(will fire a rebuild of all jurisdictions when merged).

@JeniT - I generated this with:

```bash
cd prototype/jurisdictions
for f in *.xml; do saxon $f ../surveyor.xsl; done
```

…is that the best way to do that?