def delete!(allow_secret = false)
      GPGME::Ctx.new do |ctx|
        ctx.delete_key self, allow_secret
      end
    end
def delete!(allow_secret = false)
      GPGME::Ctx.new do |ctx|
        ctx.delete_key self, allow_secret
      end
    end
Delete this key. If it's public, and has a secret one it will fail unless
 +allow_secret+ is specified as true.