Improve error message for expired subkeys

[steve (GPGTools)]

Dear gnupg devs,

occasionally we have users showing up, no longer able to encrypt their mails due to an expired subkey. The error message gnupg delivers in this case is:

[GNUPG:] INV_RECP 0 Fingerprint
[GNUPG:] FAILURE encrypt 53

Basically saying, we don’t know what went wrong.

Is it possible to receive a more precise error message for such cases? Something like

[GNUPG:] INV_RECP 5 Fingerprint
[GNUPG:] FAILURE encrypt 153

That way it would be possible to display an informative error message including steps to solve this issue.

Kind regards,
steve (GPGTools)

PS: not subscribed to list so please cc: me in replies.
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