Deletes 0-length segments (except first segment of course) in tree intree. Updates regions.

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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