add Storable a => Storable (Ratio a) and Storable a => Storable (Complex a) to base

[Henning Thielemann]

On Mon, 3 Nov 2014, Brandon Allbery wrote:

> On Mon, Nov 3, 2014 at 12:57 PM, John Lato <jwlato at gmail.com> wrote:
>       Rather it makes me question whether `Ratio a` itself makes sense, and perhaps we should
>       monomorphize it to Integers.
> 
> I've been questioning that for a while, to be honest.

There could be other big integer types. In principle, Ratio also works for 
polynomials, but not in the way it is defined in 'base'.