[m-rev.] for review: delete obsolete library predicates

[Julien Fischer]

On Fri, 14 Aug 2020, Zoltan Somogyi wrote:

> This diff deletes the library predicates that we obsoleted before 2019 Jan 1,
> but keeps around the ones we have obsoleted since. Is everyone ok with that?
>
> There should be announcement in NEWS, but should it be
>
> - a single entry just saying "a bunch of obsolete preds/funcs were deleted",
> - a single entry that also lists all the preds/funcs, or
> - one entry per affected library module, listing all the preds/funcs in that module.
>
> Any preferences?

For the past two releases, we have used the third option, for example:

     ### Changes to the `version_array` module

     * The following obsolete function has been removed:

          - func `unsafe_new/2`

> I would like Julien to have a look at the update to the shift test. The rest of the
> diff is boring.

That looks fine.

Julien.