Support vacancies in spin wave theory #350
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Make linear spin wave theory compatible with
set_vacancy_at!. To simplify the indexing of a system, vacant sites are not truly removed. However, they are marked as non-magnetic withiszero(sys.κs[site]). When LSWT detects this case, all operators on the vacant site will be set to zero. Consequently, bosons on vacant sites will not be excited, and do not contribute to any intensities. Note, however, that vacant sites will still produce artificial zero-energy bands that must be ignored.