TO DO

• Dynamic DNS update support
• Finish the new_from_string functions for the A, NS, and CNAME RR types
• Finish porting the DNS.pm module
  • yxrrset()
  • nxrrset()
  • yxdomain()
  • nxdomain()
  • rr_add()
  • rr_del()
• Finish porting the Resolver.pm module
  • nameservers()
  • cname_addr()
  • send_tcp()
  • bgsend()
  • bgread()
  • bgisready()
  • axfr()
  • read_tcp()
• Finish porting the Packet.pm module
  • data()
• Add support for more resource record types:
  • MX
  • PTR
  • AAAA
  • LOC
  • TXT
  • HINFO
  • AFSDB
  • EID
  • ISDN
  • MB
  • MG
  • MINFO
  • MR
  • NAPTR
  • NIMLOC
  • NSAP
  • NULL
  • PX
  • RP
  • RT
  • SOA
  • SRV
  • TSIG
  • X25