add missing backlinks to ssl(3)

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

ssl.h HISTORY up to 0.9.2b; researched from OpenSSL git

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

various minor cleanup;

Make sure all manual pages discussing X509_NAME objects
reference X509_NAME_new(3). Sparingly add a few other
references to relevant X509_NAME*(3) pages while here.

Add documentation for SSL_add_file_cert_subjects_to_stack(3) and
SSL_add_dir_cert_subjects_to_stack(3), written from scratch.
Both functions are listed in ssl(3) and <openssl/ssl.h> and recommended
f

Add documentation for SSL_add_file_cert_subjects_to_stack(3) and
SSL_add_dir_cert_subjects_to_stack(3), written from scratch.
Both functions are listed in ssl(3) and <openssl/ssl.h> and recommended
for the use by browsers in source code comments, so they are clearly
public interfaces.

Mention deduplication.
Purge some duplicate text and improve some wording while here.
Two additional cross references instead of the useless ssl(3).
Add HISTORY, AUTHORS, and BUGS.

It is depressing that BUGS (purely from code inspection) became
longer than the DESCRIPTION.

show more ...

Copyright and license

move manual pages from doc/ to man/ for consistency with other
libraries, in particular considering that there are unrelated
files in doc/; requested by jsing@ and beck@