* src/itree.c (itree_iterator_start): Fix docstring typo. * test/manual/noverlay/itree-tests.c: Stop defining unused ITREE_DEBUG. Replace removed names and APIs with current ones, e.g. interval_tree_init is now called itree_init, and itree_iterator_finish no longer exists. Ensure preconditions of itree API are satisfied before use, e.g. by zero-initializing instances of itree_node before inserting them into a tree.