PLoS supp. material by Hermann Cuntz
Saves tree intree into a TREES internal .mtr format using
a Matlab type workspace file.
intree can be a structured tree or a cell array of structured tree
or a cell array of cell array of structured trees (2-depth).
This type of file can be read directly by the GUI (see below)
and the 2-depth in that case allows to arrange in groups of trees.
>> save_tree (sample2_tree)
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