smartctl now returns sensible values (bitmask). See smartctl.h

    for the values.  I may add some additional values as time goes on,
    so this is prelimiary.

    The SMART status check now uses the correct ATA call.  If failure
    is detected we search through attributes to list the failed ones.
    If the SMART status check shows GOOD, we then look to see if their
    are any usage attributes or prefail attributes have failed at any
    time.  If so we print them.

    Modified function that prints vendor attributes to say if the
    attribute has currently failed or has ever failed.


git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@86 4ea69e1a-61f1-4043-bf83-b5c94c648137