makes it easier to understand which should be included and how they work.
Also added a new pair of files, utility.[ch].  These should be used for
general-purpose utility functions that are not specific to either ATA or SCSI,
or to smartd or smartctl.


git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@448 4ea69e1a-61f1-4043-bf83-b5c94c648137