Catch- and cleanup: o  Fix and improve comments and references, o  Add PFIL_HOOKS, UFS_ACL and UFS_DIRHASH, o  Switch from SCHED_4BSD to SCHED_ULE, o  Remove SCSI_DELAY (there's no SCSI support),
Catch- and cleanup:
o  Fix and improve comments and references,
o  Add PFIL_HOOKS, UFS_ACL and UFS_DIRHASH,
o  Switch from SCHED_4BSD to SCHED_ULE,
o  Remove SCSI_DELAY (there's no SCSI support),

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