Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Mention fdescfs(5) and why it might be useful.

MFC after: 1 week
Suggested by: Stephen Montgomery-Smith <stephen at math dot missouri dot edu>

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

$Id$ -> $FreeBSD$

add missing cvs Id lines.

Remove my failed attempt to add an Id string.

Restore fd.4 to a machine-independent directory.

This commit was generated by cvs2svn to compensate for changes in r1638,
which included commits to RCS files with non-trunk default branches.

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