updated to use raw netio.cpp functions, instead of high-level
Network class object.
new wrappers around low-level network operations.
network.h no longer needed.
network.h not needed.
removed log silliness
tzset stubs for riscos and macos
changed to use netio.h instead of network.h
removed old networking interface.
new Network class abstractions based on the proxy networking interface.
changed network.h to network2.h
modified includes
removed lots of old and unused code.  simplified autoproxy finder.
added proxyver variable to store current proxy version.
added probfill_noblocks and probfill_disabled constants.
merged changes from main branch.
removed socket conditioning.
proxymessage variable added to Network class.  nofallback rollover
handling error corrected.
synced with proxy.
sync with proxy.
corrected handshaking issues with http.  invalid sockets are now
detected via INVALID_SOCKET, not 0.