Sorting for all listings & bugfixes for all listings except Newsletters

- newsletters listing now uses hash history
- newsletters are sorted by Subject (a->z)
- segments are sorted by Name (a->z)
- re-added WordPress Users list as a segment you can send a newsletter to
- added explicit error messages when an auto newsletter isn't fully configured
- added missing strings for "selectAll" in Segments listing
- fixed filters() in Subscribers listing (wrong count as it was not taking groups/filters/search into account)

lib/Models/Subscriber.php

@@ -206,7 +206,9 @@ class Subscriber extends Model {
     );
   }
 
-  static function filters($orm, $group = 'all') {
+  static function filters($data = array()) {
+    $group = (!empty($data['group'])) ? $data['group'] : 'all';
+
     $segments = Segment::orderByAsc('name')->findMany();
     $segment_list = array();
     $segment_list[] = array(