do not show obj_type ACTIVITY_OBJ_FILE under activity notifications and do not mark those read in /network

Zotlabs/Module/Ping.php

@@ -400,9 +400,11 @@ class Ping extends \Zotlabs\Web\Controller {
 			$r = q("SELECT id, item_wall FROM item
 				WHERE item_unseen = 1 and uid = %d
 				$item_normal
-				and author_xchan != '%s'",
+				AND author_xchan != '%s'
+				AND obj_type != '%s'",
 				intval(local_channel()),
-				dbesc($ob_hash)
+				dbesc($ob_hash),
+				dbesc(ACTIVITY_OBJ_FILE)
 			);
 
 			if($r) {