Submission export limited to 20 rows

Hi there :).

I don't expect you to accept this pull request - it's just a way of me showing the quick fix I did. It's a terrible solution. I didn't have time to look too much into it, so just did this in the meantime until a proper fix can be found.

As you can see in data.js, I've just increased the Ajax request limit to 100000 rows, and this allowed the export to return more than the default 20.