Remove X509_check_trust documentation

Two new manual pages X509_TRUST_set(3) and X509_check_trust(3)
documenting ten functions related to X509_TRUST objects,
trust identifiers, and trust indices.

new manual page X509_print_ex(3)

new manual page for X509_keyid_set1(3), X509_keyid_get0(3),
X509_alias_set1(3), X509_alias_get0(3)

add new manual page for X509_add1_trust_object(3) and X509_trust_clear(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@

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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 0.9.5; researched from OpenSSL git

x509.h HISTORY up to SSLeay 0.8.1b; researched from OpenSSL git

Consistently mark up various ASN.1 type names defined in standards
related to X.509 with .Vt such that they can be searched for.

Write new X509_CINF_new(3) manual page from scratch. These functions
are listed in <openssl/x509.h> and in OpenSSL doc/man3/X509_dup.pod.
Note that the OpenSSL documentation specifies the wrong head

Write new X509_CINF_new(3) manual page from scratch. These functions
are listed in <openssl/x509.h> and in OpenSSL doc/man3/X509_dup.pod.
Note that the OpenSSL documentation specifies the wrong header file.

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