SDD:  Add report variable requests

The following plant related requests have been added.

Output:Variable,*,Plant Supply Side Cooling Demand Rate,hourly;
Output:Variable,*,Plant Supply Side Heating Demand Rate,hourly;
Output:Variable,*,Chiller Evaporator Cooling Rate,hourly;
Output:Variable,*,Cooling Tower Heat Transfer Rate,hourly;
Output:Variable,*,Boiler Heating Rate,hourly;
SDD: Warn using default minimum air flow fraction