pop3: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentication mechanism, such
as CRAM-MD5 or NTLM, the server doesn't support the LOGIN or PLAIN
mechanisms and (lib)curl doesn't fallback to APOP or Clear Text
authentication.

Bug: http://curl.haxx.se/mail/lib-2013-02/0004.html
Reported by: Stanislav Ivochkin
imap: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentication mechanism, such
as CRAM-MD5 or NTLM, the server doesn't support the LOGIN or PLAIN
mechanisms and (lib)curl doesn't fallback to Clear Text authentication.

Note: In order to fallback to Clear Text authentication properly this
fix adds support for the LOGINDISABLED server capability.
imap: Fixed no known authentication mechanism when fallback is required

Fixed an issue where (lib)curl is compiled without support for a
supported challenge-response based SASL authentication mechanism, such
as CRAM-MD5 or NTLM, the server doesn't support the LOGIN or PLAIN
mechanisms and (lib)curl doesn't fallback to Clear Text authentication.

Note: In order to fallback to Clear Text authentication properly this
fix adds support for the LOGINDISABLED server capability.

Related bug: http://curl.haxx.se/mail/lib-2013-02/0004.html
Reported by: Stanislav Ivochkin
configure: update the copyright years for the output.
updated copyright years.
pop3.c: Updated variable names to use shorter / more readable variant

Tidied up code from commit 6b6bdc83bdUpdated where a few instances of
the pop3c struct variable used the longer conndata struct rather than
matching what other code in pop3_authenticate() used.
cmake: updated OpenSSL build
cmake: Fix mingw build
FAQ: clarify 5.13 How do I stop an ongoing transfer

Rich Gray provided good feedback and we now clarify that you can in fact
stop a multi transfer at any point you like by removing the easy handle.
winbuild: include version info for .dll .exe

Bug: http://curl.haxx.se/bug/view.cgi?id=1186
email: Provided extra comments following recent pop3/imap fixes

Provided additional clarification about the logic of the authenticate()
functions following commit 6b6bdc83bd36 and b4270a9af1d0.
RELEASE-NOTES: Updated following recent changes to the email protocols

Added recent additions and fixes following the changes to imap, pop3
and smtp. Additionally added another contributor that helped to test
the imap sasl changes.
CURLMOPT_MAXCONNECTS: restore functionality

When a connection is no longer used, it is kept in the cache. If the
cache is full, the oldest idle connection is closed. If no connection is
idle, the current one is closed instead.
singleipconnect: remove dead assignment

pointed out by clang-analyzer
curl_easy_perform: Value stored to 'mcode' is never read

pointed out by clang-analyzer
singleipconnect: Update *sockp for all CURLE_OK

The 56b7c87c7 change left a case where a good sockfd was not copied to
*sockp before returning with CURLE_OK
schannel: Removed extended error connection setup flag

According KB975858 this flag may cause problems on Windows 7 and
Windows Server 2008 R2 systems. Extended error information is not
currently used by libcurl and therefore not a requirement.

The flag may improve the SSL-connection shutdown in case of an
error. This means it might be a good improvement in the future.

Fixes bug/issue #1187 - thanks for the report
email: Reworked comments in the endofresp() functions

Tidied up the comments in the endofresp() functions to be more
meaningful prior to release.
Curl_proxyCONNECT: return once CONNECT is sent

By doing this unconditionally, we infer a simpler and more defined
behavior. This also has the upside that test 1021 no longer fails for me
even if I run with valgrind.

Also fixed some wrong comments.
VMS: fix and generate the VMS build config

config_h.com is a new file that generates a config.h file based on the
curl_config.h.in file and a quick scan of the configure script.  This is
actually a generic procedure that is shared with other VMS packages.

The existing pre-built config-vms.h had over 100 entries that were not
correct and in some cases conflicted with the build options available in
the build_vms.com.

generate_config_vms_h_curl.com is a helper procedure to the
config_h.com.  It covers the cases that the generic config_h.com is not
able to figure out, and accepts input from the build_vms.com procedure.

build_curlbuild_h.com is a new file to generate the curlbuild.h file
that Curl is now using when it is using a curl_config.h file.

post-config-vms.h is a new file that is needed to provide VMS specific
definitions, and most of them need to be set before the system header
files are included.

The VMS build procedure is fixed:

   1. Fixed to link in the correct HP ssl library.
   2. Fixed to detect if HP Kerberos is installed.
   3. Fixed to detect if HP LDAP is installed.
   4. Fixed to detect if gnv$libzshr is installed.
   5. Simplified the input parameter parsing to not use a loop.
   6. Warn that 64 bit pointer option support is not complete
      in comments.
   7. Default to IEEE floating if platform supports it so
      resulting libcurl will be compatible with other
      open source projects on VMS.
   8. Default to LARGEFILE if platform supports it.
   9. Default to enable SSL, LDAP, Kerberos, libz
      if the libraries are present.
   10. Build with exact case global symbols for libcurl.
   11. Generate linker option file needed.
   12. Compiler list option only commonly needed items.
   13. fulllist option for those who really want it.
   14. Create debug symbol file on Alpha, IA64.
RELEASE-NOTES: synced with 25f351424b3538

8 more bug fixes mentioned