Reset all tracking memory of the P2Tracking object.
This function removes all tracking periods added in a previous run using the P2Tracking:add_tracking_period function. It clears the memory and makes the object ready for use. The pointer to the baseline schedule set in the P2Tracking:new function will not be removed. An alternative to this method is to delete the tracking object and create a new one using the P2Tracking:new function.
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