out that SFTP requests didn't use persistent connections. Neither did SCP
ones.  I gave the SSH code a good beating and now both SCP and SFTP should
use persistent connections fine. I also did a bunch for indent changes as
well as a bug fix for the "keyboard interactive" auth.

ahost are ws2_32.lib and advapi32.lib

while () => while()
and some other minor re-indentings

callbacks needed to pass a buffer to the user.  Instead one per byte it
is now as little as one per segment.

out a problem in curl.h when building C++ apps with MSVC. To fix it, the
inclusion of header files in curl.h is moved outside of the C++ extern "C"
linkage block.

consistency

and if () so the rule is from now on => no space before the parenthesis.

connectdata struct. This will in theory enable us to do persistent connections
with SCP+SFTP, but currently the state machine always (and wrongly) cleanup
everything in the 'done' action instead of in 'disconnect'. Also did a bunch
of indent fixes, if () => if() and a few other source cleanups like added
comments etc.

happened when a user had a home dir as an empty string. curl would then do
free() on a wrong area.

due to a missing header file.

protocols listed in curl --version

always, except when --without-libssh2 was given

headers <winlap.h> and <winber.h> defines wrong calling convention.

Use a response-file for the C-compiler.

all the numericals at the top phrased "shorter" and I cut out the "number of
releases since the very beginning" since that's just the number curl releases
+ 26 and not a very interesting number anyway.

Moved Curl_file_connect into the protocol handler struct.

failed one using the multi interface

with NSS

tracker (https://bugzilla.redhat.com/show_bug.cgi?id=316191), I now made
curl-config --features and --protocols show the correct output when built
with NSS.