fixes #2386 update filters in users activity logs (#2399)

* Add an action filter and a date filter. 

* Additional filters on a specific object (photo/album/group) are available from their dedicated administration page.

* Performances of the page was improved : instead of loading 100k lines in activity table, we loop on 500 activity lines until 100 aggregated lines are found for the current page.

admin/cat_modify.php

@@ -199,6 +199,7 @@ $template->assign(
     'U_ADD_PHOTOS_ALBUM' => $base_url.'photos_add&album='.$category['id'],
     'U_CHILDREN' => $cat_list_url.'&parent_id='.$category['id'],
     'U_MOVE' => $base_url.'albums&parent_id='.$category['id'],
+    'U_ACTIVITY' => get_root_url().'admin.php?page=user_activity&album='.$category['id'],
     )
   );