Pondering if this bug should actually be there.
If delivering magnet links in a plaintext HTTP response is useless, then it is void.
On the other hand, I now seem to remember why I did that: I wanted to give the user the magnet
link for copy&paste, without spoiling the mirror list with that long, ugly thing... I think I
read some documentation about magnet links claiming that an advantage of them over torrents would
be that they can be copied & pasted. But presumably users will prefer to click on them, usually.
So we should rather link the ugly thing, and just give it a nice and simple name. "Magnet link".
So the only question is whether to keep the .magnet representation. If we keep it (why not) then
it needs to be unescaped of course.