[aur-general] AUR cleanup policy

[Sam S.]

> The search returns a dozen unmaintained packages and you have to look
> through them [...] I prefer to have a reasonable signal-to-noise ratio.

This could be solved by having search results list "stale" packages
last (and/or greyed-out or something).

"stale" could be defined as "is unmaintained and has not been updated
in 6 months", so it could be automatically derived without introducing
an extra flag..