Stop mentioning DSA/DSS

Support for this went away in 2017, but a few things still mentioned DSA
in various contexts. Replace DSA with ECDSA where appropriate and otherwise
delete this. It won't wor

Stop mentioning DSA/DSS

Support for this went away in 2017, but a few things still mentioned DSA
in various contexts. Replace DSA with ECDSA where appropriate and otherwise
delete this. It won't work.

ok jsing

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man pages: add missing commas between subordinate and main clauses

jmc@ dislikes a comma before "then" in a conditional, so leave those
untouched.

ok jmc@

Avoid gendered language in man pages when not referring to a specific
person. Rewrite or use singular they.

ok thfr@ sthen@ daniel@ ian@ job@ kmos@ jcs@ ratchov@ phessler@ and
others I'm likely miss

Avoid gendered language in man pages when not referring to a specific
person. Rewrite or use singular they.

ok thfr@ sthen@ daniel@ ian@ job@ kmos@ jcs@ ratchov@ phessler@ and
others I'm likely missing on an earlier version.
feedback tj@, feedback and ok jmc@

show more ...

Void functions obviously do not return values; no need to elaborate.
Patch from Martin Vahlensieck <academicsolutions dot ch>.

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

New manual page SSL_set_tmp_ecdh(3) written from scratch.
Feedback and OK jsing@.

nits about trailing punctuation found with mandoc -Tlint

Add Copyright and license.
Merge various updates from OpenSSL, in particular stop talking about
what happens without SSL_OP_SINGLE_DH_USE, which is now always on.

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@