Updated .gitignore for NetWare created files.

1 - str2offset() no longer accepts negative numbers since offsets are by
nature positive.

2 - introduced str2unum() for the command line parser that accepts
numericals which are not supposed to be negative, so that it will
properly complain on apparent bad uses and mistakes.

Bug: http://curl.haxx.se/mail/archive-2012-07/0013.html

Modification based on voting result:

http://curl.haxx.se/mail/lib-2012-07/0104.html

Since the order of the cookies is sorted by the length of the paths,
having them on the same path length will make the test depend on what
order the qsort() implementation will put them. As seen in the
windows/msys output posted by Guenter in this posting:
http://curl.haxx.se/mail/lib-2012-07/0105.html

The function https_getsock was only implemented properly when USE_SSLEAY
or USE_GNUTLS is defined, but it is also necessary for USE_SCHANNEL.

The problem occurs when Curl_read_plain or Curl_write_plain returns
CURLE_AGAIN. In that case CURL_OK is returned to the multi-interface an
the used socket is set to state CURL_POLL_REMOVE and the easy-state is
set to CURLM_STATE_PROTOCONNECT. This is fine, because later the socket
should be set to CURL_POLL_IN or CURL_POLL_OUT via multi_getsock. That's
where https_getsock is called and doesn't return any sockets.

Re-wrote Curl_darwinssl_random() to not use arc4random_buf() because the
function is not available prior to iOS 4.3 and OS X 10.7.

Since WinSSL cannot be build without SSPI being enabled,
USE_WINSSL now defaults to the value of USE_SSPI.

The makefile does now raise an error if WinSSL is enabled
while SSPI is disabled.

Renamed external parameter USE_SSPI = yes/no to ENABLE_SSPI = yes/no.
Backwards compatible change: USE_SSPI can still be passed as external
parameter with yes/no value as long as ENABLE_SSPI is not given.

USE_x defines are passed around with true/false values internally,
USE_SSPI is now aligned to this approach, but still accepts external
values yes/no being passed, just like the other defines.

- Changed space usage to line up with the whole file
- Renamed CFLAGS_SSPI/IPV6 to SSPI/IPV6_CFLAGS to be
  consistent with the other CFLAGS_x variables
- Make use of existing CFLAGS_IPV6 (previously IPV6_CFLAGS)
  instead of appending directly to CFLAGS

The code was printing a warning when SNI was set up successfully. Oops.

Printing the cipher number in verbose mode was something only TLS/SSL
programmers might understand, so I had it print the name of the cipher,
just like in the OpenSSL code. That'll be at least a little bit easier
to understand. The SecureTransport API doesn't have a method of getting
a string from a cipher like OpenSSL does, so I had to generate the
strings manually.

Bug #75 updated with additional info, still remains for builds with
other backends.

Reduce the number of #ifdef UNICODE directives used in source files.

Test 1008 and 206 don't show the disconnect since it happens when SWS
awaits a new request, but 503 does and so the verify section needs that
string added.

When doing CONNECT requests, libcurl must make sure the connection is
alive as much as possible. NTLM requires it and it is generally good for
other cases as well.

NTLM over CONNECT requests has been broken since this regression I
introduced in my CONNECT cleanup commits that started with 41b02378,
included since 7.25.0.

Bug: http://curl.haxx.se/bug/view.cgi?id=3538625
Reported by: Marcel Raad

I moved out the servercmd parsing into a its own function called
parse_servercmd() and made sure it gets used also when the test number
is extracted from CONNECT requests. It turned out sws didn't do that
previously!

Using this, the server will output in the protocol log when the
connection gets disconnected and thus we will verify correctly in the
test cases that the connection doesn't get closed prematurely. This is
important for example NTLM to work.

Documentation added to FILEFORMAT, test 503 updated to use this.