Improvements to pulseaudio

- Add a DEBUGGING flag
- Make the location of the unix socket configurable

While I was here I moved all the priority configs in supervisord to the top. I like it better there

overlay/etc/supervisor.d/desktop.ini

@@ -1,8 +1,8 @@
 
 [program:desktop]
+priority=50
 autostart=true
 autorestart=true
-priority=50
 user=%(ENV_USER)s
 directory=/home/%(ENV_USER)s
 command=/usr/bin/start-desktop.sh