add functions to start iteration in a subtree

add missing details for 100% test coverage in tree.c

add test for creating an iterator over an empty tree

simplify tree class

implement cxTreeDestroyNode and cxTreeDestroySubtree - resolves #438

fix missing free() in test_array_insert_sorted

fix missing free() in test_tree_add_duplicate_root

(0) -300 -100 -30 -10 -7 +7 +10 +30 +100 tip

mercurial