Convert to SU(2)
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Created by: tobiaslcmueller
SU(N) implementation converted to SU(2).
For spin S we have to think a bit more about the units: currently, the bare vertex is rescaled by 2S, as in the SU(N) formulation. This means, the correlations are in units of |J|/(2S), not |J|, as one would naively expect. Should we change that back within the correlation calculation? Or just document it, as the current behavior is consistent with the unit of the vertices?
Closes #37