Deadwood update: DNS compression code finished

I have finally finished up the DNS compression code for Deadwood.

The reason for the slow progress is because my personal life has been a lot more busy and I have had less time to devote to Deadwood. This will not change for the foreseeable future and Deadwood progress will continue to be slow.

In today's snapshot, the underlying compression and decompression libraries work. Now I have to go through and make sure they are bug-free; it's a matter of a bunch of SQA testing at this point.

People can look at the code at maradns.org/deadwood/snap