The Windows console version of stunnel is called "tstunnel", while
running "stunnel" on Windows spawns a new console window which
cannot be handled by the testsuite.

Previously LIST always returned a fixed hardcoded list that the ftp
server code knew about, mostly since the server didn't get any test case
number in the LIST scenario. Starting now, doing a CWD to a directory
named test-[number] will make the test server remember that number and
consider it a test case so that a subsequent LIST command will send the
<data> section of that test case back.

It allows LIST tests to be made more similar to how all other tests
work.

Test 100 was updated to provide its own directory listing.

Replaced the use of CURLOPT_USERPWD for the preferred CURLOPT_USERNAME
and CURLOPT_PASSWORD options and used the same username and password for
all email examples which is the same as that used in the test suite.

This is desired to support stunnel installations on Windows.

A regression introduced in 7f3b87d8 (present in the 7.21.4 release)
broke the total parser. Now skip the whitespace and the digits.

Reported-by: Justin Maggard
Bug: http://curl.haxx.se/mail/lib-2014-01/0019.html

Verify the change brought in commit 8e11731653061. It makes sure that
returning a failure from the progress callback even very early results
in the correct return code.

When the progress callback returned 1 at a very early state, the code
would not make CURLE_ABORTED_BY_CALLBACK get returned but the process
would still be interrupted. In the HTTP case, this would then cause a
CURLE_GOT_NOTHING to erroneously get returned instead.

Reported-by: Petr Novak
Bug: http://curl.haxx.se/bug/view.cgi?id=1318

memdebug.h already contains all required definitions and including
curl_memory.h causes errors like the following:

tests/unit/unit1394.c:119: undefined reference to `Curl_cfree'
tests/unit/unit1394.c:120: undefined reference to `Curl_cfree'

This is a debug function only and serves no purpose in production code,
it only slows things down. I left the code #ifdef'ed for possible future
pipeline debugging.

Also, this was a global function without proper namespace usage.

Reported-by: He Qin
Bug: http://curl.haxx.se/bug/view.cgi?id=1320