quickfix

Applied patch contributed by Jason Aubrey <jaubrey@connamara.com>:
  Added SO_SNDBUF/SO_RCVBUF socket options to session settings ("SendBufferSize", "ReceiveBufferSize")
  Fixed minor bug where the TCP_NODELAY setting from one session could be reused for subsequent sessions.
  Fixed minor bug where TCP_NODELAY was not being used in the ThreadedSocketInitiator in one case.