Sort sections: consistently put CODE REFERENCES directly before SEE ALSO.

Use Mt for email addresses.

branches: 1.19.2;
Make nanotime and getnanotime prototypes match.
Also, the BUGS section doesn't describe something fixable, so make
it a CAVEATS section instead.
Bump date.

branches: 1.18.6; 1.18.12;
Xref bintime_add(9).

Don't unnecessarily clutter the SEE ALSO.

Briefly describe and note also struct bintime.

branches: 1.15.4;
Sync with microuptime(9):
- improve punctuation
- add explicit xref to hz(9)
- use Em for HZ

Add Xref to new timecounter(9).

Merge description about bintime(9), getbintime(9), getmicrotime(9),
nanotime(9), and getnanotime(9) from FreeBSD's microtime(9) man page,
and add appropriate MLINKS.

branches: 1.12.4;
Convert TNF licenses to new 2 clause variant

branches: 1.11.10; 1.11.12;
time(9) was renamed to time_second(9), fix xrefs.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

Xref hardclock(9).

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Xref hz(9), now that it exists.

Boring whitespace fixes.

s/monotomically/monotonically/g

Comment out references to hz(9) and hardclock(9). It'd be nice
if someone wrote them, but let's not reference them until they are
written. Addresses PR kern/4901.

branches: 1.3.8;
Use full month names with .Dd, as per mdoc.samples(7).

More .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.

Manual page which describes the microtime() function for obtaining the
current value of the system realtime clock.