more changes to ffs display:

- display clean flag
- fix wording of block size and fragment size
- use correct offsets for minfree, rotdelay and rps
  (at least, correct for NetBSD and Solaris 2.6/sparc)

usr.bin/file/magdir/filesystems

@@ -65,14 +65,15 @@
 >8404	string		x		last mounted on %s,
 >9504	ledate		x		last checked at %s,
 >8224	ledate		x		last written at %s,
+>8401	byte		x		clean flag %d,
 >8228	lelong		x		number of blocks %d,
 >8232	lelong		x		number of data blocks %d,
 >8236	lelong		x		number of cylinder groups %d,
->8240	lelong		x		number of basic blocks %d,
->8244	lelong		x		number of fragment blocks %d,
->8248	lelong		x		minimum percentage of free blocks %d,
->8252	lelong		x		rotational delay %dms,
->8256	lelong		x		disk rotational speed %drps,
+>8240	lelong		x		block size %d,
+>8244	lelong		x		fragment size %d,
+>8252	lelong		x		minimum percentage of free blocks %d,
+>8256	lelong		x		rotational delay %dms,
+>8260	lelong		x		disk rotational speed %drps,
 >8320	lelong		0		TIME optimization
 >8320	lelong		1		SPACE optimization
 
@@ -80,14 +81,15 @@
 >8404	string		x		last mounted on %s,
 >9504	bedate		x		last checked at %s,
 >8224	bedate		x		last written at %s,
+>8401	byte		x		clean flag %d,
 >8228	belong		x		number of blocks %d,
 >8232	belong		x		number of data blocks %d,
 >8236	belong		x		number of cylinder groups %d,
->8240	belong		x		number of basic blocks %d,
->8244	belong		x		number of fragment blocks %d,
->8248	belong		x		minimum percentage of free blocks %d,
->8252	belong		x		rotational delay %dms,
->8256	belong		x		disk rotational speed %drps,
+>8240	belong		x		block size %d,
+>8244	belong		x		fragment size %d,
+>8252	belong		x		minimum percentage of free blocks %d,
+>8256	belong		x		rotational delay %dms,
+>8260	belong		x		disk rotational speed %drps,
 >8320	belong		0		TIME optimization
 >8320	belong		1		SPACE optimization