972110 swimming pool

Changes and additions needed to model indoor swimming pools; this work is ready for review
But this is for room air modeling, and one expects high temperature radiant heaters to be located up high, shining down.  One expects the pool to be on the floor.  While the (slight) convective gains off the HT heater should go into the upper subzone, the convective gains off a pool should go into a lower subzone for the roomair model.