engine message from apply command stack to playlist
(<class 'hooke.command.Success'>):
>>> for c in curve.command_stack:
-... print c # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE, +REPORT_UDIFF
+... print(c) # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE, +REPORT_UDIFF
<CommandMessage zero surface contact point
{..., curve: <Curve 20071120a_i27_t33.100>...}>
<CommandMessage flat filter peaks {block: retract, min points: 1}>