virtual sleep is calling the simulation also for VNA_dummy Features: -VNA_dummy and chamber_dummy uses simulated_values from shared_simulated_state -now climate_chamber_dummy, VNA dummy, Shared_simulated_state has single instance of itselfs -simulation of climate_chamber runs by virtual_time -simulation of VNA now runs by virtual_time Bug_fixes: -shared_simulated_state_file used in chamber_dummy and VNA_dummy to solve Circular import problem