Code signing

[Ralph Seichter]

* Gerben Wierda via macports-dev:

> In other words: isn’t it at some point becoming important to have some
> sort of process where we can support this?

Wearing my hat of GnuPG for OS X maintainership:

I for one will be happy to start sign installation packages and similar
artifacts as soon as Apple stops charging a 99 EUR yearly subscription
fee for open source project maintainers.

-Ralph