Extracts region by region features from a group of trees intrees
which are sufficient to constrain the artificial generation
of trees similar to the original group.
Is based on the assumption that the density of topological points
on the trees are more or less scalable.
The result is a structure spanning with some info
about the spanning fields of the individual regions throughout the trees.
ctrees contains the scaled trees.
Example:
>> dLPTCs = load_tree ('dLPTCs.mtr');
>> [spanning ctrees] = gscale_tree (dLPTCs{1})
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