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/XNetwork.cpp

@@ -0,0 +1,79 @@
+#include "XNetwork.h"
+
+//
+// XNetworkUnavailable
+//
+
+CString
+XNetworkUnavailable::getWhat() const throw()
+{
+	return format("XNetworkUnavailable", "network library is not available");
+}
+
+
+//
+// XNetworkFailed
+//
+
+CString
+XNetworkFailed::getWhat() const throw()
+{
+	return format("XNetworkFailed", "cannot initialize network library");
+}
+
+
+//
+// XNetworkVersion
+//
+
+XNetworkVersion::XNetworkVersion(int major, int minor) throw() :
+	m_major(major),
+	m_minor(minor)
+{
+	// do nothing
+}
+
+int
+XNetworkVersion::getMajor() const throw()
+{
+	return m_major;
+}
+
+int
+XNetworkVersion::getMinor() const throw()
+{
+	return m_minor;
+}
+
+CString
+XNetworkVersion::getWhat() const throw()
+{
+	return format("XNetworkVersion",
+								"unsupported network version %{1}.%{2}",
+								CStringUtil::print("%d", m_major).c_str(),
+								CStringUtil::print("%d", m_minor).c_str());
+}
+
+
+//
+// XNetworkFunctionUnavailable
+//
+
+XNetworkFunctionUnavailable::XNetworkFunctionUnavailable(
+				const char* name) throw()
+{
+	try {
+		m_name = name;
+	}
+	catch (...) {
+		// ignore
+	}
+}
+
+CString
+XNetworkFunctionUnavailable::getWhat() const throw()
+{
+	return format("XNetworkFunctionUnavailable",
+								"missing network function %{1}",
+								m_name.c_str());
+}