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.

Lines that are indented with at least 5 spaces get special treatment by
the script that converts it to HTML on the site.

The non-blocking connect improvement for IMAP showed that we didn't
properly define the Curl_ssl_connect_nonblocking function for non-SSL
builds.

Reported by: Tor Arntsen

Several --with-XXX options claimed the wrong default path in their help
outputs.

Reported by: Vincent Torri

Only download and convert the certdata to the ca-bundle.crt if Mozilla
changed the data

The Perl LWP module (which in a bit of a circular reference is used by
mk-ca-bundle.pl) is now indirectly using this script. I made this small
tweak to make it easier to automatically maintain the generated
ca-bundle.crt file in version control.

Some protocols have to call the underlying functions without regard to
what exact state the socket signals. For example even if the socket says
"readable", the send function might need to be called while uploading,
or vice versa. This is the case for libssh2 based protocols: SCP and
SFTP and we now introduce a define to set those protocols and we make
the multi interface code aware of this concept.

This is another fix to make test 582 run properly.

As a new state recently was added to the IMAP state machine it has to be
in the array of names as well as otherwise libcurl crashes when a debug
version runs...