commit d321454b8c59846e72dae1e696b4447bb6924f0c
Author: Ingo Korb <ingo@akana.de>
Date:   Sun Sep 18 16:12:02 2016 +0200

    Complain on error channel if an unknown drive code is encountered
    
    Put a message on the error channel if a M-E or Ux command is
    encountered that attempts to start a piece of drive code which sd2iec
    cannot identify.