Macports tree cleanup

[CHENG Gao]

> On a theoretical level, this makes sense and would be best addressed
> on a port by port basis. On a practical level, it's probably a
> function of available time and feedback from users that new versions
> are out and in wider adoption.
>
> If there are ports that particularly trouble you, have you contacted
> the maintainer or tried to update the port yourself?

Not really. This wont trouble me. For the apps I need, I'll search ports
first. If there is I'll install from port tree; if it's not up to date,
I'll try to figure out update or install from source. In fact I
submitted update for bogofilter and gnupg2. 

My question is more about port policy. Anyway it does not matter that
much.