prefixing a command with '*' means it is allowed to fail without
aborting the chain actions

Also, check for the session sharing bit instead of comparing pointers

Previously the age counter would be counted individually in each easy
handle that shared SSL sessions!

Bug: http://curl.haxx.se/mail/lib-2011-11/0180.html
Reported by: Mark Brand

one more bug fix and contributor

The progress bar output function would blindly use the terminal width
without bounds checking. When using a very wide terminal that caused a
buffer overflow and segfault.

We now limit the max bar with to 255 columns, and I simplified the code
to avoid an extra snprintf and buffer.

Bug: http://curl.haxx.se/bug/view.cgi?id=3435710
Reported by: Alexey Zakhlestin

591 -> FTP multi PORT and 425 on upload
592 -> FTP multi PORT and 421 on upload
593 -> FTP multi PORT upload, no data conn and no transient neg. reply
594 -> FTP multi PORT upload, no data conn and no positive prelim. reply

1206 -> FTP PORT and 425 on download
1207 -> FTP PORT and 421 on download
1208 -> FTP PORT download, no data conn and no transient negative reply
1209 -> FTP PORT download, no data conn and no positive preliminary reply

4 new bugfixes, 2 more contributors

When the user requests PORT with a specific port or port range, the code
could lock up in an endless loop. There's now an extra conditional that
makes sure to special treat the error and try the local address only
once so a second failure will abort the loop correctly.

Bug: http://curl.haxx.se/bug/view.cgi?id=3433968
Reported by: Gokhan Sengun

Just a sign of where the code originally was ripped out from. Now it is
generic "pingpong".

This test is created to verify Rene Bernhardt's patch which makes sure
libcurl properly _not_ deals with Negotiate if not asked to even if the
proxy says it can serve it.

If a proxy offers several Authentication schemes where NTLM and
Negotiate are offered by the proxy and you tell libcurl not to use the
Negotiate scheme then the request never returns when the proxy answers
with its HTTP 407 reply.

It is reproducible by the following steps:

- Use a proxy that offers NTLM and Negotiate ( CURLOPT_PROXY and
CURLOPT_PROXYPORT )

- Tell libcurl NOT to use Negotiate CURL_EASY_SETOPT(CURLOPT_PROXYAUTH,
CURLAUTH_BASIC | CURLAUTH_DIGEST | CURLAUTH_NTLM )

- Start the request

The call to CURL_EASY_PERFORM never returns. If you switch on debug
logging you can see that libcurl issues a new request As soon as it
received the 407 reply. Instead it should return and set the response
code to 407.

Bug: http://curl.haxx.se/mail/lib-2011-10/0323.html

Move calling of ERR_remove_state(0) a.k.a ERR_remove_thread_state(NULL)
from Curl_ossl_close_all() to Curl_ossl_cleanup().

In this way ERR_remove_state(0) is now only called in libcurl by
curl_global_cleanup(). Previously it would get called by functions
curl_easy_cleanup(), curl_multi_cleanup and potentially each time a
connection was removed from a connection cache leading to premature
destruction of OpenSSL's thread local state hash.

Multi-threaded apps using OpenSSL enabled libcurl should still call
function ERR_remove_state(0) or ERR_remove_thread_state(NULL) at the
very end end of threads that do not call curl_global_cleanup().

Now called 'use_ssl' instead, which better matches the current CURLOPT
name and since the option is used for all pingpong protocols (at least)
it makes sense to not use 'ftp' in the name.

Use gnutls_priority_set_direct() instead of gnutls_protocol_set_priority().

Remove the gnutls_certificate_type_set_priority() use since x509 is the
default certificate type anyway.

Reported by: Vincent Torri

Make NODATACONN425 and NODATACONN421 return a 150 positive preliminary reply
before 425 or 421.

New NODATACONN150 returns 150 without further positive nor negative reply

Now NODATACONN doesn't reply anything at all.

Make NODATACONN custom commands apply to both active and passive FTP,
and ensure 425 and 421 are not returned unless data channel usage is
attempted.

Adjustments that make NODATACONN custom commands fully usable.

Try to be a little more descriptive about the effect of this flag,
rather than parroting what was said in the paragraph just above.

Some torture tests left FTP test server in an unresponsive state, resulting
in torture tests that actually completed following unexpected code paths.

Changes in this commit solely address this issue and some adjustments for
ftpserver.pl logging relative to data channel establishment and tear down.
Pending NODATACONN relative adjustments reserved for a further commit.

Ensure verification takes place with no server commands file.
Ignore verbose setting for running server precheck.
Tweak unresponsive server message, to allow detection by haxx.se scripts.