records: updates "big-file" section for AliESD

* (closes #688)
records: adds average download time in popups

* (addresses #685)
records: updates output text for average_download

* (closes #685)
records: updates "Citation" field

* (closes #693)
records: updates "big"-files displaying

* adds AJAX functionality to “big”-file-box, to asynchronously paginate
* adds functionality to dynamically choose words for caution box
* (closes #684)