Remove ENGINE Xr that I left behind

fix grammar

Strip out mentions of ENGINE_load_builtin_engines()

There's probably more that needs to be updated here, but that can be done
another day.

Simple adjustments for DSO removal

openssl.cnf.5 will need a major overhaul. But that isn't new...

Document X509_get_default_cert_area(3).
Put it into this page because this is the code actually using it.
Despite its name and include file, it is unrelated to X.509
and unrelated to certificates: it

Document X509_get_default_cert_area(3).
Put it into this page because this is the code actually using it.
Despite its name and include file, it is unrelated to X.509
and unrelated to certificates: it is just the default directory
containing the library configuration file, openssl.cnf(5).

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Further improve the documentation of library initialization and configuration.
Among other improvements:
* Use a uniform wording at the top of the DECSRIPTION for obsolete pages.
* Better explain how

Further improve the documentation of library initialization and configuration.
Among other improvements:
* Use a uniform wording at the top of the DECSRIPTION for obsolete pages.
* Better explain how to use a non-standard configuration file.
* Remove obsolete functions from SEE ALSO.
Triggered by some suggestions from tb@.
Tweaks and OK tb@.

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escape backslashes;
patch from Peter Piwowarski <peterjpiwowarski at gmail dot com>

crypto HISTORY up to 0.9.7; researched from OpenSSL git

In crypto.h rev. 1.43 and ssl.h rev. 1.153 2018/03/17 16:20:01, beck@
provided OPENSSL_init_crypto(3) and OPENSSL_init_ssl(3).
Write the documentation from scratch
because the text OpenSSL provides i

In crypto.h rev. 1.43 and ssl.h rev. 1.153 2018/03/17 16:20:01, beck@
provided OPENSSL_init_crypto(3) and OPENSSL_init_ssl(3).
Write the documentation from scratch
because the text OpenSSL provides is full of bloat.

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import openssl.cnf(5) and x509v3.cnf(5) from OpenSSL;
below OpenBSD quality standards, but better than nothing...

Add Copyright and license.
Merge some typo fixes, a paragraph documenting another flag,
and some additional explanations and EXAMPLES from OpenSSL.

various cleanup;

first pass; ok schwarze

Convert five more manuals from POD to mdoc.
I found drafts of these in my tree, probably originally from
Max Fillinger, that just needed minor polishing.