various EXIT STATUS fixes; from Daniel Dickman

bump the posix reference in STANDARDS to IEEE Std 1003.1-2008, with a few
updates to follow;

i saw the previous was wrong as soon as i committed it: put the
built-in blurb in STANDARDS; we did once have a COMPATIBILITY section
which we merged with STANDARDS, so i think this is appropriate. i

i saw the previous was wrong as soon as i committed it: put the
built-in blurb in STANDARDS; we did once have a COMPATIBILITY section
which we merged with STANDARDS, so i think this is appropriate. it
certainly feels better than adding single sentences randomly to the
end of text bodies.

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document, consistently, those apps which also exist as built-ins
on certain shells; do not try to document changes between the
implementations, but at least warn of their existence;

diff from Ingo S

document, consistently, those apps which also exist as built-ins
on certain shells; do not try to document changes between the
implementations, but at least warn of their existence;

diff from Ingo Schwarze

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convert to new .Dd format;

- use a consistent text for STANDARDS
- note which options are extensions to POSIX

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Various cleanups and standardizations.

- remove trailing white space
- remove arguments from .Os macros
- remove arguments from .Nm macros, where appropriate
- some more Dq/Sq/Ql insanity
- still lots to do in the usr.bin tree... :/

usr.bin/ man page fixes, t-z

rcsid

initial import of NetBSD tree