fixed problem with opening client and server. in some cases it

would fail to open in such a way that it could never succeed
but it'd never stop retrying.  now terminating when open fails
such that it'll never succeed.

lib/client/CXWindowsSecondaryScreen.cpp

@@ -229,7 +229,7 @@ CXWindowsSecondaryScreen::createWindow()
 		int majorOpcode, firstEvent, firstError;
 		if (!XQueryExtension(display, XTestExtensionName,
 								&majorOpcode, &firstEvent, &firstError)) {
-			// FIXME -- subclass exception for more info?
+			log((CLOG_ERR "XTEST extension not available"));
 			throw XScreenOpenFailure();
 		}