Mention the type-specific BIO_ctrl(3) command constants
in the manual pages of the respective BIO type.
While here, fix some wrong return types in the SYNOPSIS.

Mark a number of BIO_ctrl(3) command constants as intentionally
undocumented because they are NOOPs or deprecated.

Document the RETURN VALUES of BIO_method_type(3) and BIO_method_name(3)
for the various BIO types.

new manual page BIO_dup_chain(3)

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@

show more ...

Document prototype change and return values for BIO_set_cipher()

ok jsing

In evp.h rev. 1.59 2018/05/02 15:51:41, tb@ added a const qualifier
to the return value of BIO_f_base64(3), BIO_f_cipher(3), and
BIO_f_base64(3). Update the documentation.

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

crypto HISTORY up to SSLeay 0.9.1; researched from OpenSSL git

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

make sure that all the BIO pages point back to the master page BIO_new(3)

Add Copyright and license.
Delete the useless statement that a void function does not return a value.

various cleanup;

first pass; ok schwarze

Add missing CVS Mdocdate tags. No text change, except for the change
of date that can't be helped.

second batch of perlpod(1) to mdoc(7) conversion