Hi friends,

I've written up a lil' patch that introduces support for pausing libcurl
transfers. The pausing can be done with curl_easy_pause() or by returning the
magic return code from the read or write callbacks. See details in the
curl_easy_pause.3 man page which is incluced in the patch.

Unpausing a transfer is done using curl_easy_pause().

I'm interested in comments on both the API/concept but also on how it actually
works, as I've only tested it slightly but it seems to work fine for me.

Also, if/when we include this in the code, I think it warrants a minor version
number bump.

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