choose an intro point, connect to it,
choose a rend point, connect to it and establish a cookie,
get an ack from the rendezvous point,
and know when both circs are ready for her.
APConns don't use conn->purpose anymore
don't initiate a renddesc lookup if one is already in progress
also fix a buffer overflow in nickname parsing (only exploitable
by the operator though)
svn:r1471
(this breaks the compile; must fix things)
let alice react when she learns a new rendezvous descriptor
let alice launch intro and rend circuits and mark them with her query
svn:r1446