Split NS / A Replies

This release fixes a few bugs with debugging output, and also
introduces new -a and -n (--ns) flags for specifying the
(IPv4-only, at the moment) replies to IN A and IN NS queries.

Finishing Touches

Improvements

• netip.cc now properly responds with IN SOA, IN NS and select IN A records for DNS authority.
• Query response times are now tracked on standard output
• New --version, -v flag for getting the current version / copyright information-
• Another round of afl fuzzing uncovered some new crashes/hangs, so those got fixed.

Debutante Ball

This is the initial release of netip.cc.