Fix Chianti transitions with AI & swapped levels
Chianti v10 contains transitions with the level indices swapped, meaning that lower index > upper index. Arrack checked only that the upper index be less than the maximum index allowed for our AI cut. In the case of fe_18, this let a few AI transitions in the .wgfa file. As a result, Cloudy crashed on a bounds-checking run. Here, we remove fe_18.wgfa transitions with either index referring to AI levels. We also reverse the index order in some .wgfa and .splups files so that the lower index appears first.
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