15  CHANGED: ASORT()
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     1.  ASORT() now returns a reference to the target array.

     2.  ASORT() now supports an optional code block argument that can
         be used to determine order.  Each time the block is evaluated,
         two elements from the target array are passed to the code block
         as parameters.  The block must return true (.T.) if the
         elements are in sorted order.  This facility can be used to
         create a descending or dictionary order sort.