[Vala] GSL binding problem: OdeivEvolve::apply

[Feng Yu <rainwoodman gmail com>]

Dear Martin,

I notice another issue with Gsl binding.
In Gsl.OdeivEvolve::apply,
the time t and the step size are defined as an array.

But they are really in-out parameters, which should be defined as 'ref'., aka:

ref double t, ... ref double h.

I don't know if there are also similar issues around.

Best,

Yu