improve tree iterator struct and add signature for a function that can create an iterator

first draft of a tree iterator

add cx_tree_search() - relates to #165

be honest at least in the lib version

fix missing typedef

declare cx_tree_search_func function pointer

add code documentation for tree functions

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

mercurial