Add a "Most Viewed" sort option to the Gallery

BWH436

I'd like to have a "Most Viewed" option in the "Arrange" pull-down menu in the Gallery.

I've uploaded and tagged over 500 newspaper articles (mostly obituaries) in the Gallery with about 200 (and counting) in the queue to upload. Periodically, I wonder whether the effort is worthwhile, at which point I check the Memories to find out which ones have actually been viewed. Seeing non-zero view counts on some of them usually gives me the motivation to keep going. Having an option to sort the Memories in descending order by views would help a lot.