Strip mention of ENGINE out of *_set_method.3

Fix another mandoc -Tlint warning

With this the only -Tlint warnings are about Xr to undocumented functions:
EVP_CIPHER_CTX_copy, EVP_CIPHER_CTX_get_cipher_data, X509V3_EXT_get_nid.

spelling
ok tb@

Delete the display of the RSA_METHOD object
which is now supposed to be opaque.
OK tb@

I checked that all the information contained in comments in the
display is available from the appropriate place

Delete the display of the RSA_METHOD object
which is now supposed to be opaque.
OK tb@

I checked that all the information contained in comments in the
display is available from the appropriate places in RSA_meth_new(3)
and RSA_set_flags(3). Note that the comments regarding "mod_exp",
"init", and "finish" were half-misleading simplifications, anyway.

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In rsa.h rev. 1.40, gilles@ provided several new RSA_METHOD accessors.
Update the documentation.
OK tb@ jmc@

*an* RSA;

* Do not document the non-existent function RSA_null_method(3).
* Add three missing const qualifiers to function prototypes.
* Correct the argument type of RSA_new_method(3).
* Remove duplicate decsr

* Do not document the non-existent function RSA_null_method(3).
* Add three missing const qualifiers to function prototypes.
* Correct the argument type of RSA_new_method(3).
* Remove duplicate decsription of RSA_flags(3) and RSA_new_method(3).
* Make the description of method selection simpler, more precise,
and more concise.
* Correct description of the return value of RSA_set_method(3).
* Stop referencing engine(3).

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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

crypto HISTORY up to 0.9.4; researched from OpenSSL git

rsa.h HISTORY up to SSLeay 0.9.0; researched from OpenSSL git

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

In rsa.h rev. 1.38 2018/03/17 15:12:56 and dsa.h rev. 1.30 2018/03/17
15:19:12, tb@ provided a subset of the DSA_meth_*(3) and RSA_meth_*(3)
functions. Merge the relevant parts of the manual pages f

In rsa.h rev. 1.38 2018/03/17 15:12:56 and dsa.h rev. 1.30 2018/03/17
15:19:12, tb@ provided a subset of the DSA_meth_*(3) and RSA_meth_*(3)
functions. Merge the relevant parts of the manual pages from
OpenSSL, heavily tweaked by me, in particular for conciseness.

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Change all references to rsa(3) to point to RSA_new(3) instead.
Make sure all RSA pages point back to RSA_new(3).

minor cleanup;

Copyright and license

first pass; ok schwarze

convert RSA manuals from pod to mdoc