Sort datasets by uploaded time

[MVarshini]

PBENCH-1306

Sort datasets by uploaded time

[webbnh]

We can try this out, but addParams() is a fairly low-level function, and I'm afraid that this may have unintended consequences. I suspect that the requested sort order parameter should be added at a higher level in the call stack.

That is, I think that this does exactly what we want for the "new results" list but not necessarily what we want for the "saved results" list, and I believe that there are several other places where this change will have an effect (on the Results and Visualization pages, e.g.). And, I'm wondering if this will break pagination if a new result is uploaded (e.g., if one user is looking at the Results page and another user uploads a new public result, then the "next" page will be off by one result (because all of the results would have been shifted "down" by one when the new result is added ot the "top"), probably resulting in a dataset being listed twice).