s/dipslay/display/ in comments.

fix various typos in comments, messages and documentation.

Final bit of PR 41200: headers that declare ioctls should include sys/ioccom.h.
This covers most if not all of the MD headers.

XXX: a lot of the ioctl definitions in some of these files are cutpasted.

branches: 1.9.156; 1.9.176;
Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.

branches: 1.8.2;
o replace definitions by declarations in header files
o put definitions where due
o cleanup some types (u_int -> vaddr_t's for example)
o minor other cleanup

- ANSIfy
- remove some trailing spaces/tabs
- minor style nits

branches: 1.6.42; 1.6.44; 1.6.48;
- Cleanup for -Wall and -Wstrict-prototypes
- Added support for multiple floppy drives
- CyberVision64:
- has now a real console mode
- another bugfix for boards with the new S3 chip
- Ariadne:
- fixed crashes with aeput (mbuf failure)

new RCS ID format.

little bit of KNiFeing, view and ite ioctl names cleaned. ite bell
values made sensical for users. (that is pitch,msec not period,count)

cleaned up include's relocated grf/* stuf to grfabs*.

Fixed my incorrect copyright.

Integrate recent changes done to the amiga branch. Includes support
for the '40.
Support for more scsi controllers (zeus, magnum)
Support for more tapes (in st.c)
New custom chip console code integrated.