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Allow to split nodes differently #956
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It would be good to give control over the way
split_nodesplits the node.Oftentimes, we want to push the singular values left or right, to move the center of orthogonality while we split the node (e.g. in the standard 2-site DMRG).
To my knowledge, currently
split_node_full_svdhas to be used in this case, which is kind of roundabout.