I don't know these FS very well so I did not change things, except:
- "SCSI_LOW_LEVEL" should be "SCSI_LOWLEVEL" (without the "_" between
"LOW" and "LEVEL").
- RAID append mode is deprecated, so I removed it.
And I've fixed some issues in kernel-config.py as well.
clarify the rationale of the package and kernel support.
Note that we actually do not need this package if we only need to mount
FAT fs, not create or check or relabel it.
