Made tests less likely to false alarm.

dlib/test/bayes_nets.cpp

@@ -335,7 +335,7 @@ namespace
         bayesian_network_gibbs_sampler sampler;
         matrix<double,1,8> counts;
         set_all_elements(counts, 0);
-        const unsigned long rounds = 200000;
+        const unsigned long rounds = 500000;
         for (unsigned long i = 0; i < rounds; ++i)
         {
             sampler.sample_graph(bn);