PLoS supp. material by Hermann Cuntz
Returns Nx1 vector eucl containing the Euclidean (as the bird flies) distance
[in Ám] between all points on the tree intree and the root (by default)
or any other node defined by its index inode.
inode can also be a 3-tupel of XYZ coordinates.
>> eucl_tree (sample2_tree)'
[0, 10, 20, 29, 38, 47, 57, 67, 53, 27, 36, 43, 51, 54, 35]
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