New: Add ability for numbering module to not be shown if a condition is not true.

htdocs/includes/modules/barcode/phpbarcode.modules.php

@@ -38,7 +38,15 @@ class modPhpbarcode extends ModeleBarCode
 	var $version='dolibarr';		// 'development', 'experimental', 'dolibarr'
 	var $error='';
 	
-    /**     \brief      Renvoi la description du modele de num<75>rotation
+	/**     \brief     	Return if a module can be used or not
+	*      	\return		boolean     true if module can be used
+	*/
+	function isEnabled()
+	{
+		return true;
+	}
+
+	/**     \brief      Renvoi la description du modele de num<75>rotation
      *      \return     string      Texte descripif
      */
     function info()