Fix the check code to pass 5 arguments instead of 6.  This typo was
introduced by commit aebfd4cf (cmake: fix gethostby{addr,name}_r in
CurlTests, 2014-10-31).

Bug: https://github.com/bagder/curl/pull/379
Reported-by: Daniel Seither

Bug: http://curl.haxx.se/mail/lib-2015-08/0016.html
Reported-by: Eric Ridge

"can not" => "cannot"

closes #377

closes #376

Closes #375

Closes #374

Return 0 instead of NGHTTP2_ERR_CALLBACK_FAILURE if we can't locate the
SessionHandle. Apparently mod_h2 will sometimes send a frame for a
stream_id we're finished with.

Use nghttp2_session_get_stream_user_data and
nghttp2_session_set_stream_user_data to identify SessionHandles instead
of a hash.

Closes #372

closes #371

This reverts commit e6749055.

... since libidn has since been fixed.

Otherwise the build only pretended to use GSS-API

Closes #370

Reported-by: Tim Stack

Closes #359

... since it went old and thus was expired and caused the test to fail!

Added support for generating the full man page based on code from
generate.bat.

To allow for the full generation of tool_hugehelp.c added detection of
the required programs - based on code from generate.bat.

Rather than duplicate future variables, during clean-up of both success
and error conditions, use a common function that can be called by both.

Commit f08e30d7 broke compatibility with DOS and non Windows NT based
versions of Windows due to the use of the setlocal command.

Bug: http://curl.haxx.se/mail/lib-2015-08/0019.html
Reported-by: Inca R

File Not Found

The system cannot find the file specified.

Ensure that there isn't a mismatch between setlocal and endlocal calls,
which could have happened due to setlocal being called after certain
error conditions were checked for.

Allow the -help command line argument to be specified in any argument
and not just as the first.

closes #366