prototypes for create and destroy functions

add allocator and root node pointer to tree structure

allow find() member function to start in an arbitrary subtree

provide a default tree node layout, but do not make it mandatory

first draft of a class for high level trees

add bounding parameter to cx_tree_add_iter()

fix misleading documentation that could have indicated that an allocator is optional for lists

make all function attributes leading - fixes #425

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mercurial