Changes for issue 50

Open "debugit" in binary mode ("rb").

Added Traian Nicolescu's patches for threaded resolver on
Windows. Plugged some potential handle and memory leaks.

Refs.
  http://curl.haxx.se/mail/lib-2004-10/0134.html
  http://curl.haxx.se/mail/lib-2004-10/0157.html

and password fields properly in URLs, like
ftp://us?er:pass?word@site.com/. Added test 191 to verify the fix.

Set errno = ENOMEM on faild countcheck().

by gcc 3.4

MSVC uses 'i64' suffix for 64-bit sizes.

on my solaris 2.7 box too (currently unknown perl version)

our strtoll() replacement function.

Andy Cedilnik reported. Warning on HP-UX?

warnings.

constants.

our own in the formdata.c file to prevent warnings on systems without it

for maximum portability

work with libidn < 0.5.6

Added tld_check_name().

Fixed tld_check_name(). idna_to_unicode_lzlz() should never fail,
but return FALSE if 'uc_name == NULL' just in case.

USE_LIBIDN: Added Top-level-domain (TLD) check for host->name.
Only print a warning if check fails.

CURLOPT_FOLLOWLOCATION, libcurl reported error if a redirect happened even if
the new URL would provide the resumed file. Test case 188 added to verify the
fix (together with existing test 99).