Remove a couple of lies about GOST in CMS

Sprinkle a few references to RFC 8419

use n-bit <noun> consistently; ok schwarze for the principal of the idea,
and for flagging which pages to check;

CMS didn't make the 6.6 release: adjust the text in the HISTORY sections

Tweak cross references, in particular making sure that
all CMS pages are linked to CMS_ContentInfo_new(3) both ways
and that closely related pages reference each other.

some cleanup:
* avoid repetitions and jumping back and forth between the functions
* more precision regarding which ASN.1 types and fields are involved
* mark up the ASN.1 type and field names
* expl

some cleanup:
* avoid repetitions and jumping back and forth between the functions
* more precision regarding which ASN.1 types and fields are involved
* mark up the ASN.1 type and field names
* explain CMS_REUSE_DIGEST more precisely
* move the discussion of attributes to CMS_NOATTR where it belongs
* GOST does not need an ENGINE in LibreSSL, so don't use it as an example
* add the missing STANDARDS section
* and minor wording improvements

show more ...

bring HISTORY sections up to OpenBSD standards

Re-convert and re-import the CMS manual pages from OpenSSL 1.1.1
(which are still under a free license) with pod2mdoc(1) now that
jsing@ has begun work to provide these APIs.
Some formatting was impr

Re-convert and re-import the CMS manual pages from OpenSSL 1.1.1
(which are still under a free license) with pod2mdoc(1) now that
jsing@ has begun work to provide these APIs.
Some formatting was improved and some typos were fixed, but apart
from that, little was changed, so there is still much to polish.

show more ...

Convert and enable CMS manuals.
Already some time ago, bcook@ said these can be installed.