obvious .Pa fixes; found with mandocdb(8)

Use the fancy .In macro for includes. From Jan Klemkow. ok jmc schwarze

zap end of line whitespace;

Adds the (somewhat silly) _CS_V[67]_ENV and _CS_POSIX_V[67]_* defines
to <unistd.h> and confstr(3) per POSIX 1003.1-2008

Change confstr(_CS_PATH) to operate directly instead of calling sysctl(3)

ports build tested by espie@

convert to new .Dd format;

confstr() should return 0, not (size_t)-1, on errors; from Guy Harris.
ok millert@ and jmc@ for the man page bit.

Be correct in our man pages when talking about NUL termination (that is,
termination with '\0') vs. null termination.
Input from krw@, jaredy@, jmc@. OK deraadt@

more display/list fixes, and a little whitespace;

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rescinded 22 July 1999.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

- clean up macro abuse
- section reorder
- merge COMPATIBILITY

- remove all trailing whitespace
* except when it is escaped with a `\' at the end of the line
- fix remaining .Nm usage as well
- this is from a patch I received from kwesterback@home.com, who has been
working on some scripts for fixing formatting errors in mdoc'd man pages

Ok, so there could be a cost/benefit debate with this commit, but since I have
the patch we might as well commit it...

After some constructive criticism from pjanzen@ and some e-mail tag:

- only use the .Dv NULL form when referring explicitly to a function
argument or return value
- otherwise, use these forms:
o non-null
o null-terminated (hyphenated form for predicate adjective)
o else, null terminated, or null terminate, whichever the case
o null pointer, null byte, null string, etc.
- may use NUL to refer to an ASCII NUL, but it doesn't need a .Tn macro

In general, capitalizing the word "null" everywhere is unnecessary and makes
the man pages harder to read. The above is consistent with popular programming
texts (i.e., K&R, Stevens).

repairs; go back over some old files, because we should properly distinguish
between NUL and NULL, i.e., don't use the .Dv (defined variable) macro when
referring to an ASCII NUL

repairs

more missing .El macros filled in

remove argument from .Os macros so value in /usr/share/tmac/mdoc/doc-common
is used instead; kwesterback@home.com

use Bx macro for BSD versions

use Xr more often

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

branches: 1.1.1;
Initial revision