fixup! b1a2b14

KTL's suggestion for setting the seed while not changing the meaning (much).

src/math/Random.cc

@@ -69,7 +69,7 @@ void Random::initialize() {
     }
     // This seed is guaranteed to be non-zero.
     // We want to give a non-zero seed to GSL to avoid it choosing its own.
-    unsigned int useSeed = _seed % (std::numeric_limits<unsigned long>::max() - 1) + 1;
+    unsigned long int useSeed = _seed == 0 ? std::numeric_limits<unsigned long int>::max() : _seed;
     ::gsl_rng_set(rng, useSeed);
     _rng.reset(rng, ::gsl_rng_free);
 }