[aevol_post_change_size_neutral_mut.cpp] Fix seed option not changing rng

src/post_treatments/aevol_post_change_size_neutral_mut.cpp

@@ -131,7 +131,11 @@ int main(int argc, char ** argv) {
     wanted_size = inputJson.getIndividuals()[0]->amount_of_dna() + delta;
   }
 
-  Individual * indiv = run_to_size(wanted_size, inputJson.getIndividuals()[0]);
+  auto mut_prng   = std::make_shared<JumpingMT>(seed_prng);
+  auto stoch_prng = std::make_shared<JumpingMT>(seed_prng);
+  Individual ancestor = Individual(inputJson.getIndividuals()[0], 0, mut_prng, stoch_prng);
+
+  Individual * indiv = run_to_size(wanted_size, &ancestor);
   std::vector<Individual*> indiv_vector;
   indiv_vector.push_back(indiv);