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

scm automatic cleanups.

NAT/Net: pxtcp_pmgr_connect: Solaris doesn't report either POLLERR or POLLHUP for failed connect(2). Refactor code to always check SO_ERROR on Solaris so that we can reject failed connection attempt immediately instead of accepting it only to reset on the first socket operation.

NAT/Net: Convert couple of missed checks to SOCKET_ERROR.

NAT Network: On Windows FD_CLOSE is reported for incoming FIN, not on full close, so define HAVE_TCP_POLLHUP accordingly.

NAT/Net: Fix corner case of incorrect wraparound in ring buffer logic that may lead to loss of data.

NAT/Net: Careful with that DWORD... It's unsigned, so assigning negative values to it is a bad idea, especially when a coercion to a wider signed type is about to happen. While here, don't test that DWORD values are <= 0, just test for zero instead. In particulat this fixes returning socket errors from pxtcp_sock_recv() and pxtcp_sock_send() wrappers on Windows.

NAT/Net: Solaris doesn't report POLLHUP for TCP sockets.

NAT/Net: OS X reports POLLHUP when inbound closes, not when both sides are closed. Co-opt existing !HAVE_TCP_POLLHUP code written for NetBSD (where POLLHUP is never reported) to handle the case then inbound closes first. Makes inbound half-close work on OS X. Otherwise almost the same object code is generated, modulo trivial changes (exactly the same without them).

NAT/Net: return negated errno from pxtcp_sock_recv()/pxtcp_sock_send() on error.

NAT/Net: Hide checking for transient errors (EWOULDBLOCK &co) in an inline function to prevent #ifdef sprawl.

NAT/Net: Start untangling errno vs. winsock mess. Don't refer errno directly, while here convert some perror() calls to DPRINTFs.

NAT/Net: #define LOG_GROUP LOG_GROUP_NAT_SERVICE

pxtcp_pcb_forward_outbound: move code to do sendmsg/WSASend to a separate function.

pxtcp_sock_read: move code to do recvmsg/WSARecv to a separate function.

Fix indentation.

G/c leftover DPRINTFs for closesocket().

pxtcp_pmgr_chan_pollin: don't request POLLIN on the socket if we have already received EOF while the message was in transit.

Change vestigial names proxytest.* to proxy.*

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

Check for PXREMAP_FAILED now that it can actually happen.

pxtcp_pmgr_connect: delete forgotten old code for handling POLLNVAL, the new, right one is just below.

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