New upstream release
    Removed graphciz from BuildRequires. It is not used
    Removed patch for fortify_source on el6. It is merged upstream
    Small workaround for test suite problem with old readline/curses on el6
    Now fully using  bcond_with python3, for simpler future deprication of python2
    Added -fno-exceptions to CFLAGS on el6, see upstream issue #2793