[export] create a parameter that will force to skip the filtering by center (ACL) when generating an export

src/Bundle/ChillMainBundle/DependencyInjection/Configuration.php

@@ -116,8 +116,12 @@ class Configuration implements ConfigurationInterface
             ->booleanNode('form_show_centers')
             ->defaultTrue()
             ->end()
+            ->booleanNode('filter_stats_by_center')
+            ->defaultTrue()
+            ->info("if set to false, the exports won't take into account the center of the people")
             ->end()
             ->end()
+            ->end() // end of 'acl'
             ->booleanNode('access_global_history')
             ->defaultTrue()
             ->end()