NetBox.vcxproj: Add vc10u.cpp.
TransferSocket.cpp: SetSockOpt(SO_KEEPALIVE)

This should fix Issue #55 (Search on FTP server)
SetSockOpt(TCP_NODELAY)
TransferSocket.cpp: Add comments.
Merge branch 'master' into far3

* master:
  TransferSocket.cpp: Add comments.
  SetSockOpt(TCP_NODELAY)
  TransferSocket.cpp: SetSockOpt(SO_KEEPALIVE)
  NetBox.vcxproj: Add vc10u.cpp.