Initial library skeleton with a simple driver program for testing.
Adding Aho-Corasick library.
Adapting AC matcher to our needs.
Implementing the basic matching code.

Doesn't quite work correctly yet.
Checkpoint.
A bunch of extensions, fixes, and infrastructure.

Still not working quiet right, test "driver.patterns3" shows the problem.
Redoing the 2nd machign state, plus a lot of cleanup.

This seesm to work now, but performance isn't great yet ...

Benchmark generally doesn't work well yet.
Initial merge of upstream version from bro.org.