JS: process the DisplayedUnits keyword in the absence of a GUIFrame instance
JS: process the DisplayedUnits keyword in the absence of a GUIFrame instance

The DisplayedUnits input determines the units use for output reports.

Signed-off-by: Harry King <409587b9e6671aa0763646191d292852dc49a658@gmail.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim