[Seaside] Join forces

[Ramon Leon]

> 
> > I like #descriptor, but again it is used by OmniBrowser.
> 
> My first thought, when I read that was, "it is?"
> 
> So I went and looked, and sure enough, OBColumn implements 
> #descriptor. But it's hardly an important selector. It's just 
> there to factor some conditionals out of #printOn:, no big 
> deal. I'll change it if that makes your life easier with Magritte.
> 
> Colin

Besides, is Magritte likely to collide with OBColumn?  If not, who cares,
use #descriptor in Magritte, it's a much better choice than #description,
and even implies an object rather than a string, it's perfect.