Normal distribution for intelligence

The start of something I mentioned doing in !2712 (merged). Basically appropriated the code for the Height generator, and removed a bunch of extra parts. Since producing a Gaussian distribution might be useful for other things, I moved the gaussianPair() function so that it can be accessed at anytime and anywhere in the game. I also reappropriated FCGudder's height debug tool to generate this graph for the generated heights. Had to tweak a few things to get it to display properly, so subtract 100 from every number and you'll get what the Intelligence generator actually outputs.