do not default to check_for_new_version True until we have a pseudo thread...

do not default to check_for_new_version True until we have a pseudo thread doing that [or else in heavy net load Gajim takes a long time and user think we need to hugely optimize our code]

src/common/config.py

@@ -88,7 +88,7 @@ class Config:
 		'before_nickname': [ opt_str, '<' ],
 		'after_nickname': [ opt_str, '>' ],
 		'send_os_info': [ opt_bool, True ],
-		'check_for_new_version': [ opt_bool, True ],
+		'check_for_new_version': [ opt_bool, False ],
 		'usegpg': [ opt_bool, False ],
 		'log_notif_in_user_file': [ opt_bool, True ],
 		'log_notif_in_sep_file': [ opt_bool, True ],