Make an identical copy of timescene: a new timescene (with hardcopied dynamic and object) with the same time and object_time is created by sending "hardcopy" to the superclass Scene and to timescene->dynamic.
Make a softcopy of timescene: like "hardcopy" but object and dynamic are softcopied (only the used data is copied). If new_tsc is not NULL then this instance is used to store the copy otherwise a new TimeScene instance is created.
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