[LAD] jack client autoconnection

[Krzysztof Foltman]

Kjetil S. Matheussen wrote:

> The simple solution is just to make jack aware, somehow, that
> sometimes the client softwares wants to autoconnect, and that
> there must be a way to turn that off.

And a way tell where exactly it should be autoconnected, if it's 
enabled. In certain cases, it's not system:playback_1 and 2, it may be a 
different pair of outputs or even a non-physical port. See Dave 
Robillard's mail.

Krzysztof