1, telling the position of the item in the tree.
The last item always has position 1.0.  The first item in a tree of
size 10 has position 0.1.
<p>
<A NAME="avl_size"></A><HR><PRE><B>int avl_size(Avl_node p);
</B></PRE>Return the number of nodes in an AVL tree.
<A NAME="avl_smallest"></A><HR><PRE><B>void *avl_smallest(Avl_node p);
</B></PRE>Return the smallest (leftmost) item in an AVL tree.
<A NAME="avl_zap"></A><HR><PRE><B>void avl_zap(Avl_node p);
</B></PRE>Free an entire AVL tree.
This does not affect an