Break `abs` into two aspects

[Dannyu NDos]

Rational is applicable the suggested new functions.

2020년 1월 28일 (화) 오후 7:49, Henning Thielemann <lemming at henning-thielemann.de>님이
작성:

>
> On Tue, 28 Jan 2020, Dannyu NDos wrote:
>
> > 3. Step 2:
> >
> > Second, I suggest to move `abs` and `signum` from `Num` to `Floating`:
> >
> >     class Floating a where
> >          abs :: a -> a
> >          signum :: a -> a
> >          ...
>
> Rational is not Floating, but has reasonable abs and signum.
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