Update to the 0.81.0
    
    new version 0.81.0 is released now, which fixes also a not strict input validation (see also http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612489)
    
    Package and signature files can be found here:
    ftp://ftp.bieringer.de/pub/linux/IPv6/ipv6calc/
    
    Major changes:
        (none)
    
    Minor changes:
        - stricter input validation
        - add some more auto-output selections depending on input
        - some minor bugfixing
    
    Maintenance:
        - Database updates