Closer to making nPanels/TotalArea implementation work
Changed units of dT_nominal to TempDiff
Changed FlatPlate.heaLos m_flow_nominal to reference TotalArea
Added TEnv to T for state identification
Added TemperatureDifference change to dT_nominal in PartialHeatLoss
Removed error caused by nPanels/TotalArea programming (still not verified)