Notable changes:
* New psk-crack program to crack IKE Aggressive Mode pre-shared keys.
* Support for IKE over TCP.
* New --random (-R) option to randomise the target list.
* The identity payload for aggressive mode may be specified as either a
string or hex.
* Ability to use the OpenSSL MD5 and SHA1 hash functions.
* Many more backoff fingerprints and vendor ID patterns added.