gaim-libnotify by default

[David Prieto]

> What is the relation of this to gaim-guifications, and why one over
> the other?

Well, they accomplish the same task actually. I think gaim-libnotify
should be chosen over guifications for integration purposes: most other
apps are using libnotify to display their notifications, so using it
would feel just natural while guifications could stand out a bit - look
out of place, if you will.

Also, guifications takes 10x disk space but I wouldn't consider that too
important, as it's only a 150k difference.