Update remarks on default parameters for Argon2.

Fix release builds with MKARGON2=yes

This changes argon2 from a separately built library into a private
dependency of libcrypt and removes the argon2(1) utility (we already
have pwhash(1)). Giving libcrypt more library dependencies
complicates things (e.g. libcrypt is a dependency of openssl).
pthreads support gets disabled in argon2 for similar reasons.

For testing argon2, we rely on the libcrypt test suite.

adding argon2 support to libcrypt. argon2 user authentication now
available via MKARGON2=yes (3 variants supported; argon2id recommended)
before using, please read argon2 paper at
https://github.com/P-H-C/phc-winner-argon2

branches: 1.8.16;
md5 is a hashing algorithm, don't say it is used for encryption.
Ok by wiz@

Reflow to < 80 chars.

Make the format for -k clearer

branches: 1.5.34; 1.5.40;
Merge single-letter options; sync order in man page and usage.

Bump date for last and slightly improve wording.

Apply patch from PR 26779
and update man page (not quite per PR 26780).

Add NetBSD RCS Id. Sort options.

password hashing utility that allows des, md5 or bcrypt passwords to be
created in scripts; tool originally from downsj@openbsd.org;
approved by perry.

Fix release builds with MKARGON2=yes

This changes argon2 from a separately built library into a private
dependency of libcrypt and removes the argon2(1) utility (we already
have pwhash(1)). Giving libcrypt more library dependencies
complicates things (e.g. libcrypt is a dependency of openssl).
pthreads support gets disabled in argon2 for similar reasons.

For testing argon2, we rely on the libcrypt test suite.

adding argon2 support to libcrypt. argon2 user authentication now
available via MKARGON2=yes (3 variants supported; argon2id recommended)
before using, please read argon2 paper at
https://github.com/P-H-C/phc-winner-argon2

branches: 1.8.16;
md5 is a hashing algorithm, don't say it is used for encryption.
Ok by wiz@

Reflow to < 80 chars.

Make the format for -k clearer

branches: 1.5.34; 1.5.40;
Merge single-letter options; sync order in man page and usage.

Bump date for last and slightly improve wording.

Apply patch from PR 26779
and update man page (not quite per PR 26780).

Add NetBSD RCS Id. Sort options.

password hashing utility that allows des, md5 or bcrypt passwords to be
created in scripts; tool originally from downsj@openbsd.org;
approved by perry.

adding argon2 support to libcrypt. argon2 user authentication now
available via MKARGON2=yes (3 variants supported; argon2id recommended)
before using, please read argon2 paper at
https://github.com/P-H-C/phc-winner-argon2

md5 is a hashing algorithm, don't say it is used for encryption.
Ok by wiz@

Reflow to < 80 chars.

Make the format for -k clearer

branches: 1.5.34; 1.5.40;
Merge single-letter options; sync order in man page and usage.

Bump date for last and slightly improve wording.

Apply patch from PR 26779
and update man page (not quite per PR 26780).

Add NetBSD RCS Id. Sort options.

password hashing utility that allows des, md5 or bcrypt passwords to be
created in scripts; tool originally from downsj@openbsd.org;
approved by perry.

md5 is a hashing algorithm, don't say it is used for encryption.
Ok by wiz@

Reflow to < 80 chars.

Make the format for -k clearer

branches: 1.5.34; 1.5.40;
Merge single-letter options; sync order in man page and usage.

Bump date for last and slightly improve wording.

Apply patch from PR 26779
and update man page (not quite per PR 26780).

Add NetBSD RCS Id. Sort options.

password hashing utility that allows des, md5 or bcrypt passwords to be
created in scripts; tool originally from downsj@openbsd.org;
approved by perry.