!>
!> Sort the numbers in D in increasing order (if ID = 'I') or
!> in decreasing order (if ID = 'D' ).
!>
!> Use Quick Sort, reverting to Insertion sort on arrays of
!> size <= 20. Dimension of STACK limits N to about 2**32.
!> 

ID

!>          ID is CHARACTER*1
!>          = 'I': sort D in increasing order;
!>          = 'D': sort D in decreasing order.
!> 

N

!>          N is INTEGER
!>          The length of the array D.
!> 

D

!>          D is DOUBLE PRECISION array, dimension (N)
!>          On entry, the array to be sorted.
!>          On exit, D has been sorted into increasing order
!>          (D(1) <= ... <= D(N) ) or into decreasing order
!>          (D(1) >= ... >= D(N) ), depending on ID.
!> 

INFO

!>          INFO is INTEGER
!>          = 0:  successful exit
!>          < 0:  if INFO = -i, the i-th argument had an illegal value
!> 

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