cx_tree_add() fix missing spec for adding duplicates feature/tree_add

complete cx_tree_add() implementations feature/tree_add

fix return type of cx_tree_node_create_func feature/tree_add

complete specification for tree_add functions feature/tree_add

(0) -300 -100 -30 -10 -4 +4 +10 +30 +100 tip

mercurial