Fix antisite generation in mixed-valence systems #210
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Context: SMTG-Bham/doped#96
Flagged by @alexsquires, for mixed-valence systems
AntisiteGenerator
givesX_X
substitutions. Using sets instead of lists for determining the elements in the structure fixes this issue (see discussion in linked issue). Added a test for this behaviour too, and confirmed it fixes the downstream issue noted indoped