Returns for tree intree an Nx1 vector B
which is one if a given node is a branch point (more than 1 daughter node) and zero else.
Example:
>> B = B_tree (sample2_tree)'
[0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0]
>> sum (B) → number of branch points
4
>> find (B) → indices of branch points
[3, 6, 10, 12]
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