[xcrysden] plot automatically DataGrid

[max_bert at web.de]

Thanks a lot. I told Tobias about your fix and he implemented it with
the small change, since we are using UpdateSurface and not loading the
scalarField by the corresponding method.

We but we we're both looking for a command like
scripting::scalarField3D::configure -isovalue foo.

Greetings Max