Extends the class {@link ContinuousDistribution} for a distributionfrom the
Pareto family, with shape parameter
α > 0 and location parameter
β > 0. The density for this type of Pareto distribution is
f (x) = αβα/xα+1 for x >= β,
and 0 otherwise. The distribution function is
F(x) = 1 - (β/x)α for x >= β,
and the inverse distribution function is
F-1(u) = β(1 - u)-1/α for 0 <= u < 1.