ORGANIZE_PSTOneRefillStep3_UseFromWhichTime

use the new implementation of PST_OneRefillStep_3 from which time

Example: The default value is ORGANIZE_PSTOneRefillStep3_UseFromWhichTime = -1.0. If negative, the old version PST_OneRefillStep_2 is used throughout the simulation. If positive, the old version PST_OneRefillStep_2 is used until the given time, then the new version PST_OneRefillStep_3 is employed. This is temporary until PST_OneRefillStep_3 has become standard.