Roll items on the stack
_stk_roll (Integer_Type n);
This function may be used to alter the arrangement of objects on the stack. Specifically, if the integer n is positive, the top n items on the stack are rotated up. If n is negative, the top abs(n) items on the stack are rotated down.
If the stack looks like:
item-0 item-1 item-2 item-3
where item-0 is at the top of the stack, then _stk_roll(-3) will change the stack to:
item-2 item-0 item-1 item-3
This function only has an effect for abs(n) > 1.
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