DFTK.jl
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Dynamically adjust number of targeted bands in SCF
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As it says, move away from keeping n_bands fixed during the SCF.
See discussion in https://github.com/JuliaMolSim/DFTK.jl/pull/561#discussion_r783758938
Also while one is on it, remove the constraint that the number of bands is identical in each k-Point.