add cxTreeSetParent()

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

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

mercurial