PEM_def_callback(3) does not truncate its argument but merely the copy,
plus a few wording improvements

spelling
ok tb@

spelling

document PEM_X509_INFO_read(3) and PEM_X509_INFO_read_bio(3)
OK tb@

Document PEM_def_callback(3).
Move pem_password_cb(3) to the file PEM_read(3) and rewrite
its description from scratch for precision and conciseness.
Plus some minor improvements in the vicinity.
Twe

Document PEM_def_callback(3).
Move pem_password_cb(3) to the file PEM_read(3) and rewrite
its description from scratch for precision and conciseness.
Plus some minor improvements in the vicinity.
Tweaks and OK tb@.

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document PEM_ASN1_read(3) and PEM_ASN1_read_bio(3);
tweaks and OK tb@

delete references to ERR pages from SEE ALSO where such
references were already given below RETURN VALUES right above

add links back to crypto(3) to function group entry pages
and to isolated obsolete pages;
OK bcook@ jmc@

Tree structure for manual pages: crypto(3) links to 33 function
group pages, and these link on to all their second-level subpages.
Only a handful of second-level pages have third-level subpages.
So a

Tree structure for manual pages: crypto(3) links to 33 function
group pages, and these link on to all their second-level subpages.
Only a handful of second-level pages have third-level subpages.
So all crypto pages can now be reached from the www.libressl.org
frontpage via at most four clicks, in most cases three clicks.
Also link back from leaf pages to their respective group pages
and add a couple of additional links between related pages.
Triggered by a question from deraadt@.
OK jmc@ tb@

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In pem.h rev. 1.18 2018/05/13 10:47:54, tb@ added const qualifiers
to the "name", "header", and "data" arguments of PEM_write(3) and
PEM_write_bio(3). Adjust the manual.

found a complete archive of SSLeay-0.4 to SSLeay-0.8.1b tarballs
on the web, so fix up SSLeay HISTORY accordingly

pem.h HISTORY up to SSLeay 0.8.1b; researched from OpenSSL git

import PEM_bytes_read_bio(3) from OpenSSL,
dropping the secmem stuff that we don't want

minor cleanup;

import from OpenSSL with minor tweaks