Fix various typos in comments.

branches: 1.17.8;
Restore backward compatibility of UFS2 with previous NetBSD releases by
disabling support in UFS2 for extended attributes (including ACLs).
Add a new variant of UFS2 called "UFS2ea" that does support extended attributes.
Add new fsck_ffs operations "-c ea" and "-c no-ea" to convert file systems
from UFS2 to UFS2ea and vice-versa (both of which delete all existing extended
attributes in the process).

Fix all remaining typos, mainly in comments but also in few definitions and log messages, reported by me in PR kern/54889.
Also fixed some additional typos in comments, found on review of same files or typos.

branches: 1.15.34;
Use lfs32_dinode_SIZEOF instead of ufs1_dinode_SIZEOF for lfs. These
are the same so it doesn't make any difference, but technically one
should use lfs parts with lfs.

Make these compile again after changes to LFS.

branches: 1.13.18; 1.13.36;
indir-block needs to be the size of a filesystem block or bad things can happen.

branches: 1.12.2;
Fix shifting by zero.

Fix ffsv2 support.

Major overhaul:

1) Add support for multiple filesystems including ffsv1, ffsv2, lfsv1 and lfsv2.
(ffsv1 and lfsv2 are known to work. ffv2 support needs more work. lfsv1 is
probably untested.)

2) Only 32-bit Fcodes are used. All 64-bit math uses two cells. This means it
should work on 32-bit machines.

Additional work to consider:

1) Rename genfth.cf to genffs.cf, or keep it and move the ffs symbols to genffs.cf

2) Move the ffs code and the lfs code to different source files so you can
selectively fload the just the filesystems you want.

3) Add code to load ELF files directly instead of relying on the host firmware
ELF support. But, since the binary is now 7250 bytes there may not be room.

branches: 1.9.2;
Move Eduardo Horvath's license to 2 clause. OK eeh@.

Instead of bailing out with "Inode not directory", assume that the disk is
a RAIDframe mirror, apply the RAID boot offset, and try to boot again.

Fixes the problem where disks would be unbootable if partitioned normally
and then converted to RAID 1 without being zeroed first.

branches: 1.7.24; 1.7.68; 1.7.74; 1.7.78; 1.7.80; 1.7.82;
merge ktrace-lwp.

branches: 1.6.10; 1.6.20; 1.6.22;
Use RF_PROTECTED_SECTORS instead of a (wrong) magic value.
The bootblock now is able to load ofwboot from a raid1 root.

branches: 1.5.2; 1.5.4;
Track changes introduced when UFS2 was merged, so that this builds again.

Dynamically allocate the buffer we use for filesystem deblocking based on
the filesystem blocksize in the super block. Allows us to read filesystems
with block sizes > 8KB.

branches: 1.3.6; 1.3.14; 1.3.16;
Support for raidframe roots. I hope. (Someone needs to test this.)

branches: 1.2.2;
withough -> without

branches: 1.1.2; 1.1.4; 1.1.6;
move ofwboot & bootblk here; add a Makefile to build ofwboot.net