make sure that a previously used one is killed first (since they re-use the
same .pid file etc)

now runs fine.

but that worked nicely in 7.15.5. I converted it into test case 532 and
fixed the problem.

transfer support

would crash if a bad function sequence was used when shutting down after
using the multi interface (i.e using easy_cleanup after multi_cleanup) so
precautions have been added to make sure it doesn't any more - test case 529
was added to verify.

jar has died and we now instead point out our own version of that

Vista (_WIN32_WINNT >= 0x0600)

encrypt the control connection and use the data connection "plain".

it now will read the full data sent from servers. The SOCKS-related code was
also moved to the new lib/socks.c source file.

(http://curl.haxx.se/bug/view.cgi?id=1561470) that is said to crash when an
FTP upload fails with the multi interface. It did not, but I made a failed
upload still assume the control connection to be fine.

empty password or no password at all. Test case 278 and 279 were added to
verify.

FTPS

it basically was that we didn't remove the current connection from the pipe
list when following a redirect. Also in this commit: several cases of
additional debug code for debug builds helping to check and track down some
signs of run-time trouble.

currently fits in the cache, to make the cache work better especially for
pipelining cases but also for "mere" (persistent) connection re-use.