Address "UNFINISHED" PDU's

[leif81]

A number of PDU's have a comment in the header that says they are "UNFINISHED". Each of these comments will need to be reviewed to determine what if anything is still required. In some cases, the comment may be outdated. In other cases, code changes may be required.

Doing a code search for the UNFINISHED string on GitHub we can see these results:

https://github.com/search?q=repo%3Aopen-dis%2Fopen-dis-java%20UNFINISHED&type=code

[leif81]

Doing a code search for the UNFINISHED string on GitHub we can see these results:

https://github.com/search?q=repo%3Aopen-dis%2Fopen-dis-java%20UNFINISHED&type=code

For burn down purposes, as of today there are 20 results.