Smartmontools - S.M.A.R.T. Disk Monitoring Tools

smartd.cpp: Allow to configure checked NVMe Critical Warning bits. Add optional MASK parameter to '-H' directive to specify the bits to check (#1715).

smartd.cpp: Fix validity check for SCSI attribute log (#1245).

smartd.cpp: Add missing 'static'.

smartd.8.in, smartd.conf.5.in: Update EXPERIMENTAL notes.

man pages: Enable NVMe related information for all platforms.

smartd.conf.5.in: Remove outdated information about old controllers.

smartd.8.in: Rework '-A' and '-s' and add NVMe info.

smartd.conf.5.in: Rework '-H -f -p -u -t -a' and add NVMe info.

smartd.cpp: Handle only 'Available Spare' as prefailure value. Enable logging of 'Percentage Used' and 'Media and Data Integrity Errors' with '-u' instead of '-p'. Enable LOG_CRIT with '-f'.

smartd.cpp: Report changes of prefailure NVMe SMART/Health values. If '-p' directive is enabled (default), changes of 'Available Spare' (#1716), 'Percentage Used' and 'Media and Data Integrity Errors' are logged as LOG_INFO or LOG_CRIT.