Adds youtube package and Stump's amixer contrib to automatic loads.
Adds Audacious keybinds.

Various other minor changes. Most notably, *stump-radio-title*
is renamed to *mode-line-now-playing*.
Puts a guard around REDRAW-MODE-LINE, which craps itself when the mode-line
is hidden.
REPORT-CURRENT-SONG calls itself just after the end of the current song.

Or it would, if the song durations were accurate. There are several
seconds of dead time before the track change happens, whereat the
time will be dutifully reported as "0:52/0:50".