Improved autoeditor messaging.

Unknown command messages now stay on screen after display.

Example:

    Red Example Score (2013) - materials - tempo inventory (EDIT)

       1: 8=72
       2: 8=108
       3: 8=90
       4: 8=135

          elements - add (add)
          elements - move (mv)
          elements - remove (rm)
          editing - done (done)

    |> asdf
    Unknown command: 'asdf'.

    |>