[BIG CHANGE] Use SleekXMPP instead of xmpppy
xmpppy is no-longer developped (last change was one year ago)
xmpppy has some VERY important bugs (infinite busy loop when server crashes, for example)
xmpppy doesn't work with python 3.x
Why not xmpppony? It's still developped.
Bof. It still has the other xmpppy issues.
So, sleekXMPP seems great. I'll try that.
If you have better ideas, tell me.