Announcing paperbackup.py to backup keys as QR codes on paper

[Robert J. Hansen]

> Oh, as an aside, the advantage of paperkey is that it is
> self-describing.

I'll chime in with another recommendation for Paperkey.  I'm a little
surprised that your code is as large as it is, too: using an alternate
pipeline you might be able to significantly reduce code size.

(a) use Python 3's gpg module to export the secret key
(b) paperkey --output-type raw --secret-key key.gpg --output key.raw
(c) use Python 3's QR library to create a series of PNGs
(d) use Wand or PythonMagick to convert the PNGs to PDF
(e) save the PDF and you're done