Reorganized source tree. Moved client.cpp into cmd/synergy as

synergy.cpp and server.cpp into cmd/synergyd as synergyd.cpp.
Moved and renamed related files.  Moved remaining source files
into lib/....  Modified and added makefiles as appropriate.
Result is that library files are under lib with each library
in its own directory and program files are under cmd with each
command in its own directory.

lib/net/IDataSocket.h

@@ -0,0 +1,49 @@
+#ifndef IDATASOCKET_H
+#define IDATASOCKET_H
+
+#include "ISocket.h"
+
+class IInputStream;
+class IOutputStream;
+
+//! Data stream socket interface
+/*!
+This interface defines the methods common to all network sockets that
+represent a full-duplex data stream.
+*/
+class IDataSocket : public ISocket {
+public:
+	//! @name manipulators
+	//@{
+
+	//! Connect socket
+	/*!
+	Attempt to connect to a remote endpoint.  This waits until the
+	connection is established or fails.  If it fails it throws an
+	XSocketConnect exception.
+
+	(cancellation point)
+	*/
+	virtual void		connect(const CNetworkAddress&) = 0;
+
+	//! Get input stream
+	/*!
+	Returns the input stream for reading from the socket.  Closing this
+	stream will shutdown the socket for reading.
+	*/
+	virtual IInputStream*	getInputStream() = 0;
+	//! Get output stream
+	/*!
+	Returns the output stream for writing to the socket.  Closing this
+	stream will shutdown the socket for writing.
+	*/
+	virtual IOutputStream*	getOutputStream() = 0;
+
+	//@}
+
+	// ISocket overrides
+	virtual void		bind(const CNetworkAddress&) = 0;
+	virtual void		close() = 0;
+};
+
+#endif