Update Chianti to v10
Chianti version 7 allows for 5 or 9 spline points for the collision strength of a transition. By contrast, in version 10 a transition may have as many as needed (e.g., 36 points for some transitions in O+2).
Prepare Cloudy for Chianti v10 datasets, allowing it to figure out on the fly how many CS spline points a transition has.