intermixed HTTP and FTP persistant connections also work!

I merely stuffed them here before I decide where they belong and if they
are to remain at all

for what HTTP request that is being used. The old bit-style fields are still
in there as well.

added lots of explaining comments

since it has to survive http struct deletion

requests

function to get called in the curl_close() function for cleanup
auth_host is added to store the original (first) host name used