adding a new source and dest driver for AlienBrain

Hello

I am considering adding a source and destination driver for NxN's
AlienBrain. It's a bit tricky as you'll see so at this point I'm mostly
playing around with it see if it's feasible.

To start with something, I added VCP::Dest::ab and VCP::Source::ab copied
from the null version. I'm not clear wether I need to hook my stuff
somewhere else? When I run 'perl -Ilib bin/vcp' I don't see ab in the list
of source and dest I get prompted for.

Now the tricky things:

- ab has a command line interface on unix. The command line program itself
kind of sucks. I'd rather avoid having to spawn the command line
executable to perform the operations. It uses java in a bunch of .jar from
which I could get the commands executed directly maybe.

- I don't know much perl or java. Just the basics. I'm a C++ and python
guy mostly.

TTimo