RandomGeneration -- random generation function

A key in ProbabilityDistribution objects and an option for discreteProbabilityDistribution and continuousProbabilityDistribution for setting the random generation function to be used by random(ProbabilityDistribution).

Functions with optional argument named RandomGeneration:

• continuousProbabilityDistribution(...,RandomGeneration=>...) -- see continuousProbabilityDistribution -- construct a continuous probability distribution
• discreteProbabilityDistribution(...,RandomGeneration=>...) -- see discreteProbabilityDistribution -- construct a discrete probability distribution