Log Message:
- Update to 2.0.4
- Replace SED with SUBST.*
- Improve DESCR
- ok'ed snj@/wiz@

>From the Changelog:

Verison 2.0.4:
--------------
More signatures.
Improved documentation, mentions of p0f_db, etc.
[BUG] Fixed a minor problem with installation on systems w/o /usr/man/.
[BUG] Fixed a DLT_NULL problem, added a new loopback signature.
Multiple timestamp options, timestamps now read from pcap dumps.
Sync with new Windows port code.
[BUG] Fixed one-line reporting for masquerade detection.