- With ICMPv4->ICMPV6 translation,   - natpt_icmp4Echo() and natpt_icmp4EchoReply() was merged in     natpt_icmp4Informational().   - Initialize icmpv6 header structure.   - Decrement number of argument of natpt_icmp4Unreach() to 2.   - Change both argument of natpt_icmp6DstUnreach().
- With ICMPv4->ICMPV6 translation,
  - natpt_icmp4Echo() and natpt_icmp4EchoReply() was merged in
    natpt_icmp4Informational().
  - Initialize icmpv6 header structure.
  - Decrement number of argument of natpt_icmp4Unreach() to 2.
  - Change both argument of natpt_icmp6DstUnreach().

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame