small corrections and improvements

- mention sshd in addition to rexecd as the former is more widely used.
- only one backslash is used to escape whitespace and commas in lists.
- number can have an optional sign. see strtoq(3).
- clarify when a ~ character is expanded in path name list.

branches: 1.31.28;
Clean-up documentation of login.conf(5)

Remove redundant word "limit" from sentences "Maximum ...".
Note that vmemoryuse might specify both maximum and current limits.
Remove redundant 'in bytes' from the description of vmemoryuse, it's noted
in the next section describing the argument type 'size'.

Changes inspired by <riastradh> in PR xsrc/49912

Bump date for previous.

Clean-up resources (sys/sys/resource.h) usage

Add vmemoryuse to login_cap(3)
Document vmemoryuse in login.conf(5)
Document proc.pid.rlimit.vmemoryuse and proc.pid.rlimit.maxlwp in sysctl(7)
Document SBSIZE, AS, VMEM and NTHR in share/doc/psd/05.sysman/1.6.t

Reviewed by <riastradh>
Approved by <pgoyette>

Tested by Dominik Bialy

Closes PR xsrc/49912

branches: 1.28.6;
Improve wording.

add "maxthread" tunable to login.conf to adjust RLIMIT_NTHR.
PR/47626
ok'ed by christos

branches: 1.26.2;
Adjust xref for capability database file format.

branches: 1.25.2; 1.25.4;
fix a couple typos

branches: 1.24.2;
New sentence, new line.

Fix and improve markup.

Add more details for copyright and welcome.

Describe 'bool'. Update 'list'.
Inspired by FreeBSD.

Note: we could seek more inspiration from FreeBSD WRT login.conf(5)
and login_cap(3)'s implementation.

branches: 1.20.8; 1.20.14;
mention that we can now escape ,'s and whitespace using a double \\

Fix typo or mispelling.

branches: 1.18.2;
We don't fall back to the "default" login class if a login class was
given in the password file but not defined in login.conf. Just for
"no class is given". The former is an error and leads to rejection.

Add missing blank line between items.

Document 'sbsize' and 'tc'.

In `openfiles' attribute, clarify that it's the number of open file
descriptors (which could include sockets, etc.).
From jmc@openbsd.

Quote question and exclamation marks.

Document sshd(8)'s use of "host.allow" and "host.deny".
Based on [bin/12269] from Jim Bernard <jbernard@mines.edu>, tweaked by me.

Sort SEE ALSO correctly; trade empty lines for .Pp; drop superfluous .Pp's;
correct oder of sections; even comment in some .Xr's in one case.

Whitespace/punctuation fixes.

Fix the example to include leading ':'.
Fixes bin/12396 by Jim Bernard.

login(1), not (8).

- move the class explanation to the DESCRIPTION section, where it's more obvious
- format capabilitities with .Sy
- provide an example entry

use .Xr

xref login(1), not login(8)
fixes bin/10598 by Wolfgang Helbig

branches: 1.5.2;
Xref cap_mkdb(1) and add a FILES section mentioning /etc/login.conf.db.

branches: 1.4.2;
Add login_getpwclass to libutil as convenience function for
programs originally for FreeBSD.
Add parsing of "setenv" parameter which can be used to set
up an initial environment on login.

Minor formatting nits.

Update for added capabilities in login(1).

Add necessary support routines for login.conf.