[m-rev.] for review: stop supporting --tags none

[Julien Fischer]

On Tue, 28 Apr 2020, Zoltan Somogyi wrote:

> The reason for this diff is that (a) we have not used this capability
> in decades, and (b) continuing to support it would complicate
> the code I am working on for putting type representation info
> into .int files. So basically the same reason as for deleting
> the hl grade component a couple of weeks ago.
>
> For review by anyone.

That's fine.

Julien.