cx_tree_add_iter() - optimize check for empty trees feature/tree_add

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

merge changes from default branch feature/tree_add

change cx_tree_link() from prepending to appending children - fixes #391

fix mixed up arguments for calloc()

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