GSS/kerberos authentication (http://curl.haxx.se/bug/view.cgi?id=2284386)

  when uploading files to a single FTP server using multiple easy handle
  handles with the multi interface. Occasionally a handle would stall in
  mysterious ways.

  The problem turned out to be a side-effect of the ConnectionExists()
  function's eagerness to re-use a handle for HTTP pipelining so it would
  select it even if already being in use, due to an inadequate check for its
  chances of being used for pipelnining.

upcomming work to support the broadest range of Autoconf versions

when the tests stall.

address, the one on the box libcurl is running, not the 'remote' one.

used, and define HAVE_IOCTL_SIOCGIFADDR if appropriate.

calls. Added a paragraph explaining that libcurl takes care of low-level
protocol details. Made a few minor edits.

enabled and FTP disabled.

codes for all calls to malloc and strdup that were missing. I also changed
a few malloc(13) to use arrays on the stack and a few malloc(PATH_MAX) to
instead use aprintf() to lower memory use.
I also fixed a memory leak in Curl_nss_connect() when CURLOPT_ISSUERCERT is
in use.

as a known-working environment.

fix compilation on Cell (reported by Jeff Curley).

form generator.  Made the extensions part of the MIME type struct to reduce
the size and run-time relocations necessary to build the table.

also prevent buffer overflow on MSDOS when you do for example -O on a url
with a file name part longer than PATH_MAX letters

We do testing of code functions using the test suite instead!

checks for inet_ntoa_r() inet_ntop() and inet_pton()