[Cryptech Core] dnssec signer

[Paul Selkirk]

This is mostly for Jakob, but anyone else who can help is welcome.

I'm writing a Getting Started Guide, which sort of mirrors what we're
going to be doing in the Saturday workshop:
- unpack Novena, install noise board
- install binary packages from apt.cryptech.is
- sign a zone

Except we don't have the last part. The install ends with libpkcs11.so.
AIUI, we need the opendnssec signer working over this pkcs11, or we need
to quickly implement increment hashing, so we can use the bind9 signer
(see ticket #39).

				paul