New operations for a more compact version of dfuds #466
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We can modify the DFUDS representation to save bits.
To properly map from B to S, we have to store in S the description of each leaf (0000 in a k^2 tree). We can save space by omitting the description of those leaves.
Then, S will use k^2n bits, with n the number of internal nodes, instead of the number of nodes.