While working on a general-purpose caching module (out soon), I thought of

While working on a general-purpose caching module (out soon), I thought of
a better way to handle the node pointer array used in ubi_BinTree.  The
change simplified the code a bigbunch.  It also forced updates to all of
the binary tree modules.  CRH
(This used to be commit db9898559f1493ade4478196b72663759bb18995)