S9 LIB  (random-sort list)          ==>  list
        (random-sort list integer)  ==>  list

Create a random permutation of LIST and return it. When INTEGER
is specified, use it to initialize a random state (see RANDOM).
When no seed or the same seed is specified, RANDOM-SORT will
always deliver the same permutation.

(random-sort '(1 2 3 4 5))  ==>  (2 5 1 4 3)
