BUGS

    * min_owd TINT_NEVER is logged

    v hints, data for non-existing ranges
    v opens multiple channels to the same address
    v hints do not expire
    v RTT calculations need improvement (test)
    v google-log is unnecessary
    * reduce template use (peer queue)
    v hints do not expire
    v survive 10% loss
    v unlimited ping pong
    v git sha-1
    v check hints agains ack_out?_
    v check data against ack_in
    v channel suspend/wake. 3 cong modes state machine - ???
    * release hints for a dormant channel
    * minimize the number of template instantiations
    v Channel thinks how much it HINTs a second,
      picker thinks which HINTs are snubbed
    * files <1sec download : how HINTs are sent?
    v dead Channels are not killed => cannot open a new one
        (have a channel already)
    v peers don't cooperate
    * RecoverProgress fails sometime
    v leecher can't see file is done already
    v why leecher waits 1sec?
    * hint queue buildup
    * file operations are not 64-bit ready
        http://mail.python.org/pipermail/patches/2000-June/000848.html
    * recovery: last packet
    v no-HINT sending to a dead peer
    * what if rtt>1sec
    v unHINTed repeated sending
    v 1259859412.out#8,9 connection breaks, #8 rtt 1000, #9 hint - 
     mudachestvo, cwnd => send int 0.5sec
     0_11_10_075_698 #9 sendctrl may send 0 < 0.000000 & 1732919509_-49_-45_-200_-111 (rtt 59661)
     0_11_10_075_698 #9 +data (0,194)
     0_11_10_575_703 #9 sendctrl loss detected
     0_11_10_575_703 #9 Tdata (0,194)
     0_11_10_575_703 #9 sendctrl may send 0 < 0.000000 & 1732919509_-49_-44_-700_-110 (rtt 59661)
    v complete peer reconnects 1259967418.out.gz
    * underhinting causes repetition causes interarr underest causes underhinting
    * misterious initiating handshake bursts
    v whether sending is limited by cwnd or app
    * actually: whether packets are ACKed faster than sent
    * uproot DATA NONE: complicates and deceives
    v r735 goes to github; r741
    * receiver is swapping => strange behavior
    v on high losses cwnd goes to silly fractions => slows down recovery
    v code the pingpong<->keepalive<->slowstart transition
    v empty datagram hammering (see at linode)
    * make a testkit!!!
    * never back from keepalive syndrome (because of underhashing)
    * HTTP daemon, combined select() loop
    * range requests, priorities
    v LEDBAT
    * CUBIC
    v misterious mass packet losses (!data)
    
    // Ric:
    * check why the last HAVE msgs r not sent
    * data is sent even if the client has stopped
    * when initialized the piece picker might select hints from hint_out without knowing if the peer actually has it!
    * IMPORTANT: trace(bin, range) reports bins out of range! Check if bug!!