Make sure GPG keys are usable when composing non-MIME messages (bug#8955).
* mml1991.el (mml1991-epg-find-usable-key) (mml1991-epg-find-usable-secret-key): New function. (mml1991-epg-sign): Check if signing key is usable. (mml1991-epg-encrypt): Check if encrypting key is usable (bug#8955).
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