We thank O. Lisovyy, K. Bidzhiev, A. Bastianello and V. Alba for their comments. O. G. and J.-S. C. acknowledge the support from the European Research Council under ERC Advanced grant 743032 DYNAMINT. The work of O.L. (calculations for finite-size systems) was supported by the Russian Science Foundation under the grant No 17-12-01587.
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