As just discussed on the mailing list, also document how we prefer
spacing in expressions.

Ripped out from CONTRIBUTE into its own document, but also extended from
there.

..SH should be .SH

Bug: https://github.com/curl/curl/issues/705
Reported-by: Eric S. Raymond

And delete trailing whitespace
And rename section 17 to "command line tool" from "client"

Closes #702

and removed erroneous reference to test case lib509

.. and preprocessor check TLS session info is defined for all backends.

The two options are almost the same, except in the case of OpenSSL:

CURLINFO_TLS_SESSION OpenSSL session internals is SSL_CTX *.

CURLINFO_TLS_SSL_PTR OpenSSL session internals is SSL *.

For backwards compatibility we couldn't modify CURLINFO_TLS_SESSION to
return an SSL pointer for OpenSSL.

Also, add support for the 'internals' member to point to SSL object for
the other backends axTLS, PolarSSL, Secure Channel, Secure Transport and
wolfSSL.

Bug: https://github.com/curl/curl/issues/234


Reported-by:  <dkjjr89@users.noreply.github.com>

Bug: https://curl.haxx.se/mail/lib-2015-09/0127.html
Reported-by: Michael König

- Add tests.

- Add an example to CURLOPT_TFTP_NO_OPTIONS.3.

- Add --tftp-no-options to expose CURLOPT_TFTP_NO_OPTIONS.

Bug: https://github.com/curl/curl/issues/481

Some TFTP server implementations ignore the "TFTP Option extension"
(RFC 1782-1784, 2347-2349), or implement it in a flawed way, causing
problems with libcurl. Another switch for curl_easy_setopt
"CURLOPT_TFTP_NO_OPTIONS" is introduced which prevents libcurl from
sending TFTP option requests to a server, avoiding many problems caused
by faulty implementations.

Bug: https://github.com/curl/curl/issues/481

Bug: https://github.com/curl/curl/issues/666


Reported-by:  <baumanj@users.noreply.github.com>

Bug: https://github.com/curl/curl/issues/666


Reported-by:  <baumanj@users.noreply.github.com>

Reported-By: Gisle Vanem

Change the example in the docs for CURLOPT_CONNECTTIMEOUT_MS to use
CURLOPT_CONNECTTIMEOUT_MS instead of CURLOPT_CONNECTTIMEOUT.

Closes #653