new features

  * `--adapter-ip <ip-address>`: send packets using this IP address. If not

    specified, then the first IP address bound to the network interface

	will be used.

	will be used. Instead of a single IP address, a range may be specified.

	NOTE: The size of the range must be an even power of 2, such as 1, 2, 4,

	8, 16, 1024 etc. addresses.

  * `--adapter-port <ip-address>`: send packets using this port number as the

  * `--adapter-port <port>`: send packets using this port number as the

    source. If not specified, a random port will be chosen in the range 40000

	through 60000. This port should be filtered by the host firewall (like

	iptables) to prevent the host network stack from interfering with arriving

	packets.

	packets. Instead of a single port, a range can be specified, like

	`40000-40003`. NOTE: The size of the range must be an even power of 2,

	such as the example above that has a total of 4 addresses.

  * `--adapter-mac <mac-address>`: send packets using this as the source MAC

    address. If not specified, then the first MAC address bound to the network

	can send useful UDP packets instead of empty ones. Similar to

	`--pcap-payloads`.

  * `--http-user-agent <user-agent>`: replaces the existing user-agent field

    with the indicated value when doing HTTP requests.

  * `--open-only`: report only open ports, not closed ports.

  * `--output-format <fmt>`: indicates the format of the output file, which