[Gzz] Coordinates, shape

[Tuomas Lukka]

Benja: the more I think about separating shape and cs, the better
it seems.

It also ties in very nicely with my intention of making the interpolatable
parameters freeer, i.e. so that you can add others as desired.

So basically, a VobScene would be

        1) Vobs
        2) named sets of interpolated parameters
        3) connections between the two: a vob can get as its "inputs"
           several named sets.

Now, to figure out the right way of naming - just an Object would
be bad because you want to be able to say "the shape of XXX", and 
"the coordinate system of XXX". Object + int? 

        Tuomas