Hey

Ok, to allow libcurl-using applications to pick one or more authentication
methods, I made CURLOPT_HTTPAUTH a bitmask instead:

To enforce Basic:

 curl_easy_setopt(handle, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

To enforce Digest:

 curl_easy_setopt(handle, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);

To make libcurl pick one of Basic or Digest:

 curl_easy_setopt(handle, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST|CURLAUTH_BASIC);

If only one method is set, libcurl will use that immediately without checking
what the remote site wants. If more than one is selected, libcurl will fetch
the page and then pick one of the selected alternatives in an order libcurl
decides.

CURLAUTH_ANY sets all types (including future ones we might add) and
CURLAUTH_ANYSAFE sets all except Basic.

I've added two simple test cases for this (69 and 70) and the basics seems to
be working.

-- 
 Daniel Stenberg -- curl: been grokking URLs since 1998
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