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Implemented PSM20 from Badnell et al 2021 as DEFAULT
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Now writing "PSM" as an option will return to Guzman et al 2016/2017 while not writing anything will use PSM20 as default
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test suite passes clean as differences are minimal and only at high principal quantum numbers (not tested). See figures 2 and 3 from N. Badnell et al. MNRAS (2021) 507, 2922