glib/gtk minimum required versions

[Jasper Huijsmans]

Jasper Huijsmans schreef:
...
> 
> Yes. I think we should use 2.6. There are a number of API additions that 
> make it worthwhile. And we probably won't get a chance to change the 
> supported version for at least another year.
> 

Olivier, please? ;-)

Just to clear all possible confusion, I'm going to make the panel depend 
on gtk 2.6 unless you want us to use 2.4. Any objections?

	Jasper