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Reorder a real*8 array using the sort indexes computed by GR8_TRI. Note that X and XSORT must be different (i.e. sorting cannot take place within the same array).

Arguments :
        X       R*8(*)  Unsorted/Sorted array           Input/Output
        XSORT   R*8(*)  Sorted array                    Work space
        INDEX   I(*)    Integer array of sorted indexes Input
                        (obtained by GR8_TRI)
        N       I       Length of arrays                Input

Gildas manager 2014-07-01