Deletes 0-length segments (except first segment of course)
in tree intree. Updates regions.
Example:
After setting coordinates of node 5 to those of node 4,
eliminate resulting 0-length segment.
>> tree = sample2_tree;
>> tree.X(5) = tree.X(4);
>> tree.Y(5) = tree.Y(4);
>> tree.Z(5) = tree.Z(4);
>> elim0_tree (tree)
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