Fixed Subscribers' bulk actions when filtering by a segment

- filter by segment is now affected by the selected group (all, trash,...)
- updated relationship methods between subscribers & segments (to account for subsegment status)

lib/Config/Initializer.php

@@ -56,6 +56,9 @@ class Initializer {
     \ORM::configure('username', Env::$db_username);
     \ORM::configure('password', Env::$db_password);
     \ORM::configure('logging', WP_DEBUG);
+    \ORM::configure('logger', function($query, $time) {
+    //  error_log("\n".$query."\n");
+    });
 
     \ORM::configure('driver_options', array(
       \PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',