NAT/Network: Add missing Id/@file/copyright headers.

NAT/Net: Amend r95372 and do return normal poll bits along with POLLERR. While here, use the same convertion macro for FD_CLOSE/POLLHUP too and add logging for WSANETWORKEVENTS::iErrorCode.

Untabify previous.

NAT Network: WSANETWORKEVENTS::iErrorCode[] elements can be accessed only when corresponding bit is set in WSANETWORKEVENTS::lNetworkEvents, so map each event individually. On errors don't report event's normal poll bit along with POLLERR.

NAT Network: Successful FD_CLOSE is not accompanied with FD_READ, so convert it to POLLIN too.

NetworkServices: Whitespace (including tabs!) and svn:keywords cleanups by scm.

Move proxy sources from Devices/Network/lwip-new/vbox to NetworkServices/NAT where they belong.