Add AVL tree implementation and merge few RB tree related macros. If you have comments or any claims, please send me feedback and I will fix them.
-- M.Punov --------------------- AITNET - Sofia/Bulgaria - Software & Network Solutions (+359) 888 73 73 58;(+359) 2 402 4000 [demime 1.01d removed an attachment of type text/x-chdr which had a name of tree.h]
