small modelchain.py update
small modelchain.py update

For full year hourly simulations, the output screen printed a "Bifacial ratio average for 4287 datapoints", even when that average only included 1 , 2 , 3 .. datapoints at teh beginning. Modified phrasing to reflect how many datapoints are considered in that ratio average.

NREL/bifacial_radiance,NREL/bifacial_radiance,NREL/bifacial_radiance,NREL/bifacial_radiance