new minimum SSH version support for SCP, SFTP and SOCKS tests.

Some verbosity which still remains, will go out before next release.

authentication failures when using OpenSSH 2.9.9 or SunSSH.

Verified fact: Even when only using publickey authentication,
OpenSSH and SunSSH first validate the user, this implies that
if the user validation fails, 'invalid user', the publickey
authentication will not be allowed to complete.

and the write callbacks that now can make a connection's reading and/or
writing get paused.

failures when using OpenSSH 2.9.9 or SunSSH

added: 117 - Eric Landes patch for introducing the --tcp-keep* options

(http://curl.haxx.se/bug/view.cgi?id=1863171) where he pointed out that
libcurl's date parser didn't accept a +1300 time zone which actually is used
fairly often (like New Zealand's Dailight Savings Time), so I modified the
parser to now accept up to and including -1400 to +1400.

code to instead introduce support for a new proxy type called
CURLPROXY_SOCKS5_HOSTNAME that is used to send the host name to the proxy
instead of IP address and there's thus no longer any need for a new
curl_easy_setopt() option.

The default SOCKS5 proxy is again back to sending the IP address to the
proxy.  The new curl command line option for enabling sending host name to a
SOCKS5 proxy is now --socks5-hostname.

fails, just issue a warning and ignore the failure.

added 116 - bug #1863171, curl_getdate() bug

proxy do the host name resolving and only if --socks5ip (or
CURLOPT_SOCKS5_RESOLVE_LOCAL) is used we resolve the host name locally and
pass on the IP address only to the proxy.

(for next SONAME bump)

later to accept 'none' as an indication to disable connection multiplexing

 ConnectTimeout
 ForwardX11Trusted
 HashKnownHosts
 RekeyLimit
 ServerAliveCountMax
 ServerAliveInterval

- Capability of running socks5 tests must be based on ssh daemon version
  and not on ssh client version.

requires a non blank argument.

SCP, SFTP and SOCKS4 tests is now OpenSSH 2.9.9 or SunSSH 1.0

For SOCKS5 tests minimum versions are OpenSSH 3.7 or SunSSH 1.0

Use TRUE/FALSE from setup_once.h.

  decoding where a write error (or abort return from a callback) didn't stop
  libcurl's processing.

made it an unsigned int. The type was only used in the curl_sockaddr struct
definition (only used by the curl_opensocket_callback). On all platforms I
could find information about, socklen_t is 32 unsigned bits large so I don't
think this will break the API or ABI. The main reason for this change is of
course for all the platforms that don't have a socklen_t definition in their
headers to build fine again. Providing our own configure magic and custom
definition of socklen_t on those systems proved to work but was a lot of
cruft, code and extra magic needed - when this very small change of type seems
harmless and still solves the missing socklen_t problem.

is an inofficial PROXY4 variant that sends the hostname to the proxy instead
of the resolved address (which is already supported by SOCKS5).  --socks4a is
the curl command line option for it and CURLOPT_PROXYTYPE can now be set to
CURLPROXY_SOCKS4A as well.