Move ipv6-functional-probe into a single function that is used from all
places that need to know.

Make the probe function store the result in a static variable so that
subsequent invokes just returns the previous result and won't have to
probe again.

This is a new documentation for the source tree. This information has
been present since a long time at
http://curl.haxx.se/mail/etiquette.html but now it is put into a plain
text version too for wider distribution. The web version will be
automatically generated from this source document.

Curl_posttransfer is called too soon to add the final new line.
Moved the new line logic to pgrsDone as there is no more call to
update the progress status after this call.

Reported by: Dmitri Shubin <sbn_at_tbricks.com>
http://curl.haxx.se/mail/lib-2010-12/0162.html

This avoids warnings generated by autoconf 2.68.

Signed-off-by: Dave Reisner <d@falconindy.com>

When libcurl sends a HTTP request on a re-used connection and detects it
being closed (ie no data at all was read from it), it is important to
rewind if any data in the request was sent using the read callback or
was read from file, as otherwise the retried request will be broken.

Reported by: Chris Smowton
Bug: http://curl.haxx.se/bug/view.cgi?id=3195205

To reduce the risk of variable name conflicts, use CURLVERSION instead
of VERSION.

Scanned with a tool that checked for mistakes and this is the subsequent
cleanup.

Tiny tweak after Daniel's refactoring of the protocol handlers.

We have an array with the state names only built and used when built
debug enabled and this need to list all the states from the .h

Test 1119 now also makes sure that symbols-in-versions doesn't contain
any duplicates

Slightly modified to become a nicer web page when converted for the site

Added tests for a number of POP3 LIST operations, including one
that shows a curl problem when listing no messages, so is
disabled.

CURLE_CHUNK_FAILED and CURLE_FTP_BAD_FILE_LIST were introduced in
7.21.0, not 7.20.1

Reported by: Andre Guibert de Bruet

Value stored to 'len' is never read

Use (void)[variable] to inhibit unused argument/variables warnings.

Use Curl_ssl_connect_nonblocking() when upgrading the connection to
TLS/SSL while using the multi interface.

When NSS-powered libcurl connected to a SSL server with
CURLOPT_SSL_VERIFYPEER equal to zero, NSS remembered that the peer
certificate was accepted by libcurl and did not ask the second time when
connecting to the same server with CURLOPT_SSL_VERIFYPEER equal to one.

This patch turns off the SSL session cache for the particular SSL socket
if peer verification is disabled.  In order to avoid any performance
impact, the peer verification is completely skipped in that case, which
makes it even faster than before.

Bug: https://bugzilla.redhat.com/678580

As a follow-up to commit 8831000b: don't assume that the SSL powered
protocol alternatives are available.

Use the new flags field and stop using the old protocol defines.

Removed a fixed issue, added five new existing ones and clarified one of
the previous ones.

The PROT_* set of internal defines for the protocols is no longer
used. We now use the same bits internally as we have defined in the
public header using the CURLPROTO_ prefix. This is for simplicity and
because the PROT_* prefix was already used duplicated internally for a
set of KRB4 values.

The PROTOPT_* defines were moved up to just below the struct definition
within which they are used.

The protocol handler struct got a 'flags' field for special information
and characteristics of the given protocol.

This now enables us to move away central protocol information such as
CLOSEACTION and DUALCHANNEL from single defines in a central place, out
to each protocol's definition. It also made us stop abusing the protocol
field for other info than the protocol, and we could start cleaning up
other protocol-specific things by adding flags bits to set in the
handler struct.

The "protocol" field connectdata struct was removed as well and the code
now refers directly to the conn->handler->protocol field instead. To
make things work properly, the code now always store a conn->given
pointer that points out the original handler struct so that the code can
learn details from the original protocol even if conn->handler is
modified along the way - for example when switching to go over a HTTP
proxy.

- Keep RPG binding, STRING_* table end check and OS400 README up to date.