if a connection is tunneled through a proxy. A tunnel is done with CONNECT,
either when using HTTPS or FTPS, or if explicitly enabled by the app.

both with older libidn versions without idn_free() and with libidn versions
that gets installed without idn-free.h

 Gisle's previous mail. We now use this function, and thus we require libidn
 0.4.5 or later. No earler version will do.

not be used both in one request. Fixed it and added test case 172 to verify.

set to the domain .a.b.c (that is with a dot prefix). This is now fixed and
test case 171 verifies it.

once and for all

deleted trailing whitespace

properly
+ delete trailing whitespace

about that passed-in argument not being used.
* killed trailing whitespace

verification:

- when multiple common names are used (as in the curl tests), the last name
needs to be selected.

- allow comparing with encoded values, at least with BMP and ISO latin1
encoded T61strings.

if the connection is killed it blanks the pointer it points to, to make it
easier to detect usage problems whereever Curl_done() is used.

we now use it to provide more info back on connect failures.