authenticates connections and not single requests. This should make it work
better when we mix requests from multiple hosts. Problem pointed out by
Cris Bailiff.

Bailiff's bug report 768275.

for the user field. I changed it slightly to stay with strchr() only instead
of strpbrk() for portability reasons.

the multi interface

the configure script. We set it differently now and generate the
lib/ca-bundle.h file entirely.

be done on the output

   CURLOPT_SSL_CTX_FUNCTION to set a callback that gets called with the
   OpenSSL's ssl_ctx pointer passed in and allow a callback to act on it. If
   anything but CURLE_OK is returned, that will also be returned by libcurl
   all the way back. If this function changes the CURLOPT_URL, libcurl will
   detect this and instead go use the new URL.

   CURLOPT_SSL_CTX_DATA is a pointer you set to get passed to the callback set
   with CURLOPT_SSL_CTX_FUNCTION.

magic url.

include files and docs, so now I've added a custom install hook to run
make install for docs and install when data is installed at the top-level.

them properly

more output on --version/-V
mention --manual on the help output text