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

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

add test for simple destructor in trees - fixes #436

complete implementation of remaining high level tree functions

implement cxTreeInsert family of functions

add cxTreeSubtreeDepth()

implement cxTreeCreate family of functions

add functions to link/unlink nodes manually

(0) -300 -100 -15 +15 tip

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