ipcs(1): misc improvements

Sort options. Use -compact lists for compact lists.

We already use .Sh CAVEATS in many manpages, so use that instead of
artisanal (and, IMHO, sematically wrong) "restrictions".

Use consistent order for the "message queues, shared memory segments,
and semaphores" mantra (that alo matches the order the program prints
them in).

The times are printed without the leading zero for the hours, so it's
%k, not %H. $TZ takes precedence over /etc/localtime.

Document the output format of ipcs(1).

This addresses the note in the Bugs section about the incompleteness
of this manual page that has existed since revision 1.2 (1994).

Remove KVM support.

branches: 1.19.2;
Merge riastradh-drm2 to HEAD.

Use Mt for email addresses.

branches: 1.17.2; 1.17.4;
Remove unnecessary Bk/Ek pairs from SYNOPSIS.
No effective change except where I used the opportunity to sort options
and/or option descriptions.

branches: 1.16.50;
Change copyright to 2-clause BSD-copyright.
Changed with explicit permission of Thorsten Lockert (tholo sigmasoft com)

branches: 1.15.2;
New sentence, new line.

Fix option handling so that you can show information about more than
one thing at a time.
Patch from Chris Demetriou a very long time ago.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

Add Xrefs to shm*(2).

Sort sections, use standard markup for AUTHORS section, use standard headers.

Remove some unnecessary quotation marks.

Finished an unfinished sentence.

branches: 1.8.2;
Typos (from OpenBSD)

branches: 1.7.2; 1.7.6;
More and 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.

Clean up SYNOPSIS formatting.

WARNSify, fix .Nm usage, getopt returns -1 not EOF

use correct RCS Ids

some copyright updates requested by Thorsten Lockert <tholo@SigmaSoft.COM>

clean up lots

new version by Thorsten Lockert <tholo@SigmaSoft.COM>