Reproducible simulations

[pictavien]

Hi,

In several places, JBotSim uses java.util.Random class or Math.random() to produce randomized behaviors. In order to allow reproducible simulations like tests, it is unavoidable to have some mean to control pseudo-random number generators (PRNG) used by the library, examples, ... Topology could offer such API but it would mean a topology is required everywhere a random number is used. A topology is not always available, for instance in the constructor of a Node. A static API is perhaps a solution ...