for non-IOCP build: fixes breakage in integration/replicationxx, unit/dump, and unit/instrospection unit tests

Fixing non-IOCP networking issues. Remapping WSAEWOULDBLOCK==>EAGAIN, and non-blocking send() can return 0 without having client disconnect.

Work in progress. Temporary move towards separate IOCP/non-IOCP builds because of thread state issues. Neither build set is particularily stable at the moment.

Fix for issue #59. Generated FDs are used everywhere until a SOCKET handle is used by the Winsock APIs. The win32_socketmap code generates the simulated FDs and handles the mapping from these to socket handles.

Conflicts:

	.gitignore