Initial addition of tmpfs, an efficient memory file-system.  This project
was developed as part of Google's Summer of Code 2005 program.  This
change adds the kernel code, the mount_tmpfs utility, a regression test
suite and does all other related changes to integrate these.

The file-system is still *experimental*.  Therefore, it is disabled by
default in all kernels.  However, as typically done, a commented-out
entry is added in them to ease its setup.

Note that I haven't commited the required mountd(8) changes to be able
to export tmpfs file-systems because NFS support is still very unstable
and because, before enabling it, I'd like to do some other changes.

OK'ed by my project mentor, William Studenmund (wrstuden@).
Regen (DiskOnChip 0x0012).
Place mount_ptyfs.8 in man-sysutil-man (instead of man-miscfs-man) to
match mount_ptyfs.0, which is in man-sysutil-catman.
Lower the maximum number of vnodes while running this test.  Otherwise,
it won't ever succeed with default values.
Provide a translation for set_kernel_2, copied from set_kernel_1.
Fix typo.
Don't chown/unlink uninitialized lockfile if not uugetty.
From Dr. Wolfgang Stukenbrock, PR/31040.
Count the number of '%' characters in every message and ensure the
translations have the same number as the english messages.
A quick nasty check that the messages uses as printf formats are sane.
Various fixes:
file-system -> file system
make (most) lines shorter than 80 chars
use more appropriate macros
fix a few typos
add two XXX for wrong sentences I'm not sure how to fix properly
Punctuation fixes. Add another XXX.
Correct some messages which had the wrong number of format specifiers.
Sort options. Simplify macro usage. Use standard EXIT STATUS section.
Avoid duplicate if.
Fix some mistakes spotted by wiz@.
Provide a translation for set_kernel_6 as well (cut+paste from #5).
Prefer
	.In foo
to
	.Fd #include <foo>
Mark up NULL with .Dv.
Use \*[Am], \*[Lt] for HTML output.
Add missing commas in enumerations.
In mdoc, use .Pp for new paragraphs, not .br.
Punctuation nits.
Fix typo.
Bump date for previous.