string reaches > 512 bytes...

work.

call it CURLOPT_WRITEDATA.

options, more frequently used, in a future release

cookie functions need that.

I also fixed the cookie loader to properly load and deal with cookies without
contents (or rather with a blank content).

make distcheck run fine

REPLY is to be sent back before getting blanked and reverted to the built-in
action. Now, we can make CWD fail once and then succeed when retried.