add a paranoic check

add missing return otherwise we try to reschedule the socket we've just closed.

sync changelog

remove the libevent check

convert telescope to use ev instead of libevent libevent is a very cool library, I like the APIs and enjoy using it. However, telescope is not as large and doesn't have as many file descriptor, so libevent is quite ``too big'' for our needs. ev started as a small event loop on top of poll(2) for amused, and can be used here too, it just needed to grow the ability to handle several timers, as we need quite some on telescope (in fact, we use more timers than fds!)

bufio: add bufio_drain()

bufio: add bufio_handshake to control the TLS handshake

bufio: fix bufio_read for TLS

bufio: add support for client certificates

fixup for bufio: convert to new

bufio: add bufio_close()

bufio: provide bufio_free()

bufio: convert to new ev' EV_* event types unfortunate, but a small coupling with either poll(2) or ev is needed.

ev: fix registering timers from timers callbacks We can't add items to the heap while we've iterating it, so we can't directly insert new times from a timer' callback. Instead, add them to a ``reserve'' space after the end of the heap, and merge them back inside the heap after all events have been processed.

ev: fix invalid fd check