fix missing free() in test_array_insert_sorted

fix missing free() in test_tree_add_duplicate_root

fix uninitialized simple_destructor - fixes #443

implement cxTreeRemove() with re-link function

rename cxTreeRemove() to cxTreeRemoveSubtree()

fix bug when removing the root node of a tree

(0) -300 -100 -30 -10 -6 +6 +10 +30 +100 tip

mercurial