Add fixity for (==) and (/=)

[Lennart Augustsson]

The (==) and (/=) operators are non-associative on purpose.   Writing
x==y==z is much more likely to be a typo than a legitimate use case.  We
decided to make them non-associative, even though they are associative.
(Note that they have fixity already.)

On Sun, Sep 16, 2018 at 22:38 Dannyu NDos <ndospark320 at gmail.com> wrote:

> Given that they are instantized for `Bool`s, they are associative, so it
> seems approvable to give them a fixity.
>
> (Sidenote: For the monoid over (==) I suggested on last May, I stated that
> it determines if there is an even number of `True`s, but that's wrong. It
> determines if there is an odd number of `False`s.)
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