Sets and resets the .Random.seed in the global environment.
randomSeed(action=c("set", "advance", "reset", "get"), seed=NULL, kind=NULL, n=1L,
backup=TRUE)A character string specifying the action.
Random seed to be set; only for action="set".
If length(seed) == 1, then set.seed(seed) is
used, otherwise .Random.seed is assigned the value.
Number of random seeds to generate by action.
If TRUE, the previous (seed, kind) state is recorded
such that it can be reset later.
Returns a .Random.seed.
If more than one is returned, the they are returned as a list.