Even though this is only a formality (since not many people build on
Mavericks while targeting Leopard), since we still support Leopard
at the earliest, we might as well be pedantic.

It turns out that some of the constants necessary to make this feature
work are missing from Snow Leopard's Security framework even though
they are defined in the headers.

Bug: http://curl.haxx.se/mail/lib-2013-11/0076.html
Reported by: myriachan

Rather than set the authentication options as part of the login details
specified in the URL, or via the older CURLOPT_USERPWD option, added a
new libcurl option to allow the login options to be set separately.

- better describe what happens when 1 is specified as parameter
- clarify what "is ignored" means for NSS builds

This patch fixes and issue introduced in commit 7d7df831, if the
tunnel state was TUNNEL_CONNECT, waitconnect_getsock() would return a
bitmask indicating a readable socket but never stored the socket in the
return array.

Due to all the news and changes.

The temporary sockets used for Happy Eyeballs were not closed properly,
if curl exited prematurely, which this patch fixes.

Fixed authentication text due to incorrect digest-uri property.

1) To fix issues with IMAP custom replies
2) So initial space is not required in IMAP display text
3) To be more readable and understandable

As the IMAP regex could fail and $1 would not contain the command id
updated the unrecognised command response to be more generic and
realistic (like those used in the command handlers).

Additionally updated the POP3, SMTP and FTP responses.

Patch-by: "Z98"

This reverts commit 558034ab as it appears to break the auto
builds. More thought is required for this!