Address dynamic class property deprecation warnings

models/GenericTable.php

@@ -20,6 +20,13 @@ class GenericTable
 	public $form_above;
 	public $form_below;
 
+	private $sort_direction;
+	private $sort_order;
+	private $base_url;
+	private $start;
+	private $items_per_page;
+	private $recordCount;
+
 	public function __construct($options)
 	{
 		// Make sure we're actually sorting on something sortable.