Fixed typo in header.
  Remove the temporary file generated.

  compose() is a sleazy hack that just spawns the user-editor
 and then deletes the file.  Only it didn't delete the file.
  Added binding for sleep().  Fixed clear().

  Clear now doesn't overwrite the bottom line.
  Don't clear the bottom-line when redrawing.

  This allows msg() to persist.
  Added test for sleep/msg/clear.