Changes to generic model to simulate the heating load of several ERS models.

Generic models defined for:
ON80-89
ON70-79
PQ80-89
PQ70-79
BC80-89
BC70-79
AB80-89
AB70-79
ATL80-89 (Atlantic)
ATL70-79
MBSK80-89 (Manitoba and Saskatchewan)
MBSK70-79