[m-dev.] new option for library modules

[Zoltan Somogyi]

On Fri, 31 Dec 2021 00:08:46 +1100 (AEDT), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> > I have no objections to the "mercury_term_" suffix.
> 
> Will do.

The attached diff does this. The only part worth reviewing
is the diff to NEWS.

Zoltan.
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