coping with unknown keywords on --status-fd

[Neal H. Walfield]

On Fri, 16 Sep 2016 07:53:56 +0200,
Werner Koch wrote:
> On Thu, 15 Sep 2016 23:39, dkg at fifthhorseman.net said:
> > emitting a new status line like KEY_KNOWN_BAD, during signature
> > validation, but this would not be safe to ignore.
> 
> That would be a new feature of GnuPG and we can't expect that
> applications can make use of them without knowing about that feature or
> keyword.

Of course.  But, we could introduce something like: if a keyword is
preceded by a '!' and the applications does not understand the
keyword, the application should abort.

:) Neal