previously, if you called curl_easy_perform and then set the global dns
cache, the global cache wouldn't be used.  I don't see this really happening
in practice, but this code allows you to do it.

for freeing single dns cache entries

used for "exported" globals.

    - Use a global dns cache (via setting the tentatively named,
    CURLOPT_DNS_USE_GLOBAL_CACHE option to true)
    - Use a per-handle dns cache, by default
    - Use a pooled dns cache when in the "multi" interface

- patch by T. Bharath

function

be posted in a minute to the libcurl list.

with the more appropriate 'struct UrlData *' instead.

warnings, changed the Curl_open() call as the second argument was never
used anyway

curl_global_cleanup().  Update corresponding man pages...

Improve the logic in curl_global_cleanup() and curl_global_init() so that
they are not called twice if the application libraries have been
initialized and make sure to reset the init flags in curl_global_cleanup().

This is my first CVS commit :), what it does:

- Makes sure that parts of the cURL library don't get initialized twice
- Makes sure that we only free what we initialize

specify exactly what global parts to init. Thanks to Sterling Hughes really
for arguing wisely.

curl_global_* functions

and download.h