Clean up some typos and differences. Most have been normalized to
whatever form of the name occurred in the largest number of scripts.
Paulino was contacted directly and requested his email be added to all
of his credits.
dns-nsec-enum script, originally by John Bond and improved by him and
me.
Changes in dns.lua:
Add dnssec option to dns.query that adds an OPT RR with the DO (DNSSEC
okay) flag set.
Add answer fetcher for NSEC records (unused currently).
Add decoder for NSEC records.
Add rudimentary handling of the additional section in dns.encode.
Add a check that a decoder exists before trying to call it.
Also added a copy of the simplified BSD license that the new script is
under.