In preparation for additional POP3 tests, re-ordered the command
function defintions to be sorted alphabetically.

Fixed incorrect indentation used in both the RETR_pop3 and LIST_pop3
functions which was 5 and 9 characters rather than 4 and 8.

Detected by test 1132

When building the code using LLVM Clang without NGHTTP2, I was getting
this warning:
../lib/http.h:155:1: warning: empty struct is a GNU extension [-Wgnu]
Placing a dummy variable into the data structure silenced the warning.

Since it now actually says if 1.1 or a later version should be used.

The compiler test used a variable before it was assigned when it tried
to see how it acts on a mismatching prototype, which could cause a false
positive.

Recent OpenSSL uses user interface abstraction to negotiate access to
private keys in the cryprographical engines. An OpenSSL application is
expected to implement the user interface. Otherwise a default one
provided by OpenSSL (interactive standard I/O) will be used and the
aplication will have no way how to pass a password to the engine.

Longer-desc: http://curl.haxx.se/mail/lib-2013-08/0265.html

Introduce a convenience macro and keep of the column better so that it
can point out the offending column better.

Updated test 75 accordingly.

By using the correct values from the start we don't have to translate
them!

Thanks to clang-analyzer

Using the first little merge of nghttp2 into libcurl, I stumbeled on the
missing 'snprintf' in MSVCRT. Isn't this how we do it for other libcurl
files?  I.e. use 'curl_msnprintf' and not 'snprintf' directly:

When an error occurs parsing an LDAP URL, The ludp->lud_attrs[i] entries
could be freed even though they sometimes point to data within an
allocated area.

This change introduces a lud_attrs_dup[] array for the duplicated string
pointers, and it removes the unused lud_exts array.

Bug: http://curl.haxx.se/mail/lib-2013-08/0209.html

I also documented the fact that the OpenSSL engine also supports them.

CURL_HTTP_VERSION_2_0 and CURL_VERSION_HTTP2 are new

Fixes the test 1014 failure

I broke it in 2eabb7d5

comparison between signed and unsigned integer expressions

suggest parentheses around '&&' within '||' (twice)

It isn't added as a separate protocol as HTTP2 will be done over HTTP://
URLs that can be upgraded to HTTP2 if the server supports it as well.

XOAUTH2 would be selected in preference to LOGIN and PLAIN if the IMAP
or SMTP server advertised support for it even though a user's password
was supplied but bearer token wasn't.

Modified the selection logic so that XOAUTH2 will only be selected if
the server supports it and A) The curl user/libcurl programmer has
specifically asked for XOAUTH via the ;AUTH=XOAUTH login option or 2)
The bearer token is specified. Obviously if XOAUTH is asked for via
the login option but no token is specified the user will receive a
authentication failure which makes more sense than no known
authentication mechanisms supported!

Initial library considerations documented in lib/README.http2

The commit 7b074a46 to CURL_CHECK_CA_BUNDLE in 7.31 (don't check
for paths when cross-compiling) causes --without-ca-path to no longer
works when cross-compiling, since ca and capath only ever get set to
"no" when not cross-compiling, I attach a patch that works for me. Also
in the cross-compilation case, no ca-path seems to be a better default
(IMVHO) than empty ca-path.

Bug: http://curl.haxx.se/bug/view.cgi?id=1273
Patch-by: Stefan Neis