Disable window title reporting by default, since it's a security

hazard. I considered removing it completely, but I can't rule out
the possibility of an OS that actually takes security of its
terminal devices seriously, and which might be able to make sensible
and safe use of this feature.

[originally from svn r3103]

putty.h

@@ -378,6 +378,7 @@ struct config_tag {
     int no_remote_wintitle;	       /* disable remote retitling */
     int no_dbackspace;		       /* disable destructive backspace */
     int no_remote_charset;	       /* disable remote charset config */
+    int no_remote_qtitle;	       /* disable remote win title query */
     int app_cursor;
     int app_keypad;
     int nethack_keypad;