[Patch] Uglify some names in _Rb_tree

[Paolo Carlini]

Paolo Carlini wrote:

>Howard, while I finish preparing the patch proper +  some tests for
>multimap (I hope to have something by tomorrow), can you suggest a
>stategy for testing multiset (wrt the insert at lower bound thing)?!? At
>the moment, I have big troubles, if I'm not allowed to look "inside" the
>implementation details (something usually we don't do).
>  
>
Nvermind, now I see a very easy way: by using the iterator returned by
insert with hint, then incrementing or decrementing it and checking to
what it points.

Sorry ;)
Paolo.