alter package file to include necessary custom nodes for sample 6
added custom nodes for sample 6, validate input so families never have 0 or negative parameters, use python to find weather file and folder to save images.
deleted node that should not have been uploaded for this sample
changing target value of the optimization to 76% so it runs for a few more iterations.
Merge pull request #1424 from holyjewsus/post_6_daylight_hill_climb_

Post 6 daylight hill climb