[xmonad] Add systray support (to xmobar or dzen2)?

[Kai Grossjohann]

I think it would be very useful if the standard bar had systray support, 
for else it is difficult to get the position right.  This would mean 
adding the support to dzen2 or xmobar, I guess.

I guess that most people will not have many icons in the systray, so 
that the systray will be fairly short.  So I guess we do not want to 
waste a whole screen edge for the systray.  Therefore the systray should 
be on the same screen edge as the other informational windows, and this 
means dzen2 or xmobar, for xmonad users.

And trying to position both dzen2/xmobar and stalonetray (say) on the 
same screen edge is really difficult.

Kai