2 - properly escape certain letters within a DICT word to comply to the RFC2229

(http://curl.haxx.se/bug/view.cgi?id=1481217), with follow-ups by Michele Bini
and David Byron. libcurl previously wrongly used GetLastError() on windows to
get error details after socket-related function calls, when it really should
use WSAGetLastError() instead.

When changing to this, the former function Curl_ourerrno() is now instead
called Curl_sockerrno() as it is necessary to only use it to get errno from
socket-related functions as otherwise it won't work as intended on Windows.

The tag 'before_ftp_statemachine' was set just before this commit in case
of future need.

"Each command line must be terminated by a CRLF".

defines are in setup.h.

warnings. Minor edits by me.

need it.

way for emacs, and vim users should provide a similar non-polluting style

be posted in a minute to the libcurl list.

converting from 'const char *' to 'char *' to please my picky compiler
options

from urldata to connectdata, quite correctly.

and download.h