Slight adjustment to heuristic

Made dividing out a bit more fair (I think)
[(x) / (2·-5)] + [(x) / (2·-5)] + [(-5(x - 18)) / -5] = [(146) / -5] has
a heuristic of 25.
[(2x) / 2] + [(2x) / 2] + [2·-5(x - 18)] = [2(146)] has a heuristic of
22.0
Fixed the double count issue on the heuristic
Merge branch 'story' of https://github.com/thomaswp/tuxblocks into story
Added heuristic calculations debugging
More debugging notes