Produce an output token on each firing with a value that is
the current microstep, also called the current index,
of superdense time. This can only be used with
directors that implement SuperdenseTimeDirector.
Jia Zou
$Id: CurrentMicrostep.java 70398 2014-10-22 23:44:32Z cxh $
Ptolemy II 10.0
Yellow (jiazou)
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