@rnd_uniform_float(a:int, b:int)
returns a generator giving int values according to a uniform distribution P:

    P(x | a, b) = 1/(b - a + 1),   a  ≤ x ≤  b

See @rnd_bernoulli for a description of random generators.

See also Random Generators @rand,    @rand_int,    @random,    @rnd_bernoulli,    @rnd_binomial,    @rnd_exponential,    @rnd_gamma,    @rnd_geometric,    @rnd_normal,    @rnd_uniform_float,    @rnd_uniform_int