Improve error message for expired subkeys

[Werner Koch]

On Fri, 13 May 2016 13:49, wk at gnupg.org said:

> fingerprint).  To solve this I can imagine a new status message
> KEY_CONSIDERED to further explain the INV_RECV.

I have implemented that but before I push I will check how to integrate
that with GPGME.


Shalom-Salam,

   Werner

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