Update to 1.860
    
    - New upstream release 1.860
      - Signal-handling update release
      - Localized input and output record separators in MCE::Channel
      - IPC safety in MCE::Child during SIGINT and SIGTERM
      - Method $child->exit in MCE::Child now sends the SIGINT signal for extra
        reliability with MCE::Shared (previously SIGQUIT)