Sort ppa searched list by decreasing time updates

[dino99]

Some apps have numerous ppa, like wine. But the searched ppa list is mixing recent ppa with oldish and unmaintained one's, so its difficult to find an updated one.
My proposal is :
1) to built the list with the more recent updated ppa first, or
2) add a column with the latest updated date for each ppa and give the ability to sort by date
3) to remove non maintained ppa from the list (countdown time expiry, for example all older than 400 days)

I vote for the first proposal because of the search ease