Add affordance for cleaning Studies

[iainbryson]

Either

• Paginate the results so we can delete results
• Paginate the study definitions page
• Deleting the definitions deletes all results

[iainbryson]

I've implemented the last one, deleting the definitions will clean up the files.

@madjens can you elaborate on what exactly is needed here? There is no existing UI to view the results in the website, and the study definition list scrolls infinitely.

What view do you want to paginate?