code: func (h *Host) Copy(c *Host) {
  	h.Hostname = c.Hostname
  	h.IPv4Addr = copyIP(c.IPv4Addr)
  	h.IPv4Mask = copyIPMask(c.IPv4Mask)
  	h.IPv6Addr = copyIP(c.IPv6Addr)
  	h.IPv6Mask = copyIPMask(c.IPv6Mask)
  }
docs: // Copy deep copies from the given Seesaw Host.