[m-rev.] for review: convert NEWS file to markdown and begin restructuring it

[Julien Fischer]

On Tue, 31 Dec 2019, Peter Wang wrote:

> On Mon, 30 Dec 2019 23:56:51 +1100 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
>> +* We have changed the semantics of `int.abs`/1 so that it throws an exception
>> +  if its argument is equal to `int.min_int`. The old behaviour of this function
>> +  is provided by the new function `int.unchecked_abs`/1.
>
> Another minor thing. I think symbol/arity notation looks better when
> written like
>
>    `int.abs/1`
>
> instead of
>
>    `int.abs`/1
>
> both when reading as plain text and in the rendered HTML.

I'm happy to change this if that's the consnsus.

Julien.