rule for naming of random number streams

as they say in german: Kraut & Rüben

  random::RNGManager::GetInstance().RegisterRandomStream("cascade");
  random::RNGManager::GetInstance().RegisterRandomStream("qgran");
  random::RNGManager::GetInstance().RegisterRandomStream("s_rndm");
  random::RNGManager::GetInstance().RegisterRandomStream("pythia");
  random::RNGManager::GetInstance().RegisterRandomStream("UrQMD");

could be named after class or process or ...

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