Preset new values with defaulting values from code

searx/settings.yml

@@ -21,6 +21,8 @@ ui:
 outgoing: # communication with search engines
     request_timeout : 2.0 # seconds
     useragent_suffix : "" # suffix of searx_useragent, could contain informations like an email address to the administrator
+    pool_connections : 100 # Number of different hosts
+    pool_maxsize : 10 # Number of simultaneous requests by host
 # uncomment below section if you want to use a proxy
 # see http://docs.python-requests.org/en/latest/user/advanced/#proxies
 # SOCKS proxies are not supported : see https://github.com/kennethreitz/requests/pull/478