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Evolves one Branching Node.
References conf, syten::TDVP::Conf::dt, syten::TDVP::Conf::exp_conf, syten::Krylov::expLanczos(), krylov_error, syten::T3N::Tree::Node< T >::Legs, std::move(), syten::T3N::Tree::Node< T >::ndt, ops, syten::TDVP::Conf::renormalise_immediately, syten::STensorImpl::snorm(), SYTEN_ASSERT_DEBUG, total_norm_change, and syten::T3N::Tree::Node< T >::v.
Referenced by update_branch(), and update_phys_branch().