CreateRNG - Create a new random generator  
Synopsis:GeneratorType int CreateRNG -> rangen
Description:Create a new random generator of a given type and seed
it. See rngdict for the available generators, and the GNU Scientific
Library documentation for details on the generators. All random generators
produce numbers uniformly distributed on [0, 1).
Parameters:GeneratorType - any generator type found in rngdict
int - seed, a positive integer
Examples:SLI ] rngdict /knuthran get 3456 CreateRNG /krng Set
SLI ] krng drand =
References:GNU Scienctific Library,
SeeAlso:rngdict, rdevdict, CreateRDV, seed, drand, irand