Add text for reverse records
Add NewPTR
Add test infrastructure
More reverse stuff
ongoing stuff

The reverse is already in reverse, need to think how to handle this
neatly. Another issue is DNSSEC: the reverse will not be signed
unless there is another key in play.
A reverse resolution.

If an reverse record can not be found locally, forward to the forwarder
for external resolution.
Slight update to the README
make reverse answer non-auth

I'm not sure what to do with DNSSEC, make these answers non-auth, so
we at least don't have to sign them.
some more updates
Fix merge conflict