[Pianod] libao settings testing

[Perette Barella]

Off-list I got asked about output device selection.  I've added libao settings to request other devices, but nothing seems to happen on my MacBook; I'm not sure if it doesn't work or if the Mac is being "helpful" by abstracting speakers/headphones distinction away.  Can someone give the pianod-aotest.tar.gz a whirl?  The relevant pianod commands are:

set audio output driver {driver}
set audio output device {dev}
set audio output id {number}
set audio output server {server}

Related libao documentation:
http://www.xiph.org/ao/doc/drivers.html

Perette