[Seaside] Join forces

[Ramon Leon]

> I was talking about MAComponent class>>new. That seems to be 
> the main reason why methods in MAComponent aren't simple 
> additions to WAComponent.
> 
> I think we need reusable components and extend them with 
> Magritte behaviour and do not create Magritte specific 
> components. Of course I don't mean it absolutely.

MAComponent isn't necessary, you can use Magritte fine without it as long as
you fix #description on your own WAComponent base class.  Everything else in
MAComonent is for convenience.