The statistic shown in the Output variable sheet for all the outputs was in previous versions
representing the entire simulation also when the PrePeriod Date was different from the Simulation StartDate.
In the new version of today the Statistics should correspond exactly to the StartDate and EndDate only.
Note that some variables in the Additional Variable group with names as AccXXXXX still show the
accumulation of the variable from the PrePeriod Date and not from the Simulation Period StartDate. Those
cumulation variables are counting from the start of the simulation (PrePeriod Date)
However, the initial value of the Simulation period corresponds to the value at the start of the simulation period.
