[Gecode] Fundamental change of managing the current space

[Gabor Szokoli]

Christian Schulte wrote:

>One deficiency of the gecode design has been that it relied on a global
>variable refering to the current space. This has been done just out of
>laziness and now was the time to do it right (TM).
>  
>

I for one welcome our new explicit parameter :-)

As of this morning, I beleive to have adapted the automake process and 
the alice binding.
If build problems persist, let me know.


Gabor