cat_tree.......  concatenates two trees
delete_tree.......  delete a set of nodes
elim0_tree.......  eliminates zero-length segments
elimt_tree.......  replace multifurcations with bifurcations
insert_tree.......  insert a number of points into a tree
insertp_tree.......  insert nodes along a path in a tree
recon_tree.......  reconnect sub-trees to new parent nodes
repair_tree.......  restore full BCT conformity
resample_tree.......  redistributes nodes on tree
root_tree.......  add tiny segment at tree root

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