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Stacked on #1187.
Partially addresses #947.
This module was written for the Mastic VDAF. Mastic uses a binary tree in two ways: (1) path building from candidate prefixes; and (2) a breadth-first traversal for computing the evaluation proof. None of the functionalities implemented in the
bt
module support these operations efficiently. Instead, Mastic implements these operations directly.Remove the unused code from the
bt
module, leaving only the data types used by Mastic/VIDPF. It may be useful to keep these in their own module, as the data types may eventually be useful for Poplar1/IDPF.