'SORTLN' by Joe Horn; *quickly* sorts a list of numbers into order.

100% supported System RPL; will work on present & future HP 48's.

Be sure only to use a list of REAL NUMBERS as the input to this
routine; any other objects in the list will cause undesirable results.

Sample execution times of lists of random numbers:

LIST SIZE   SECONDS TO SORT
---------   ---------------
     16       0.4
     32       0.9
     64       2.4
    128       6.3
    256      16.5
    512      42.7

Thanx to Brian Maguire & Mike Morgan for concepts used here.