Improve Fine Opacity Mesh Resolution
Fine opacity resolution is given in cont_createmesh.cpp:158. The fine opacity mesh is needed for a lot of rt calculations. We should resolve a gaussian for the heaviest element/atom/molecule in the coldest environment, ideally. Currently, we don't go below 10^4 K, and we want to "resolve" each element. Increasing fine mesh resolution by a factor of 3 in the npSplit branch did not show significant changes; the biggest affect seen was in the big FeII models in tsuite/slow.